Soo HumbleBundle now Region Lock your purchases to the region your account is made from ...

it's not down to Humble bundle it's down to the dev/publisher of the key - region locks are mention in the thread of the bundles by Lily

It also applies to bundles. Maybe you can try buying from other websites like fanatical or greenmangaming for the key.

Some times bundle keys have a region lock too (like example, if buy on NA, you get a key only for NA on that cases). And Humble doesn't tell us it before made the purchase.

Region restrictions are really confusing and I still don't completely understand them. I created a thread back when I was trying to buy a copy of Doom to gift and every site I went to said something different about where it could be activated. Most of them said something about only being able to activate it in the country or region where it was purchased, but I don't think the store can control that, I think the region restriction is decided when the key is produced from Steam and as far as I know, the stores buy keys in bulk and have them in stock to give you when you make your purchase, so they wouldn't be able to set a region restriction at the time of purchase. I guess they could buy groups of keys for different regions though and give you a key for your region at the time of purchase.

If this person is someone you trust and not just a random person online, maybe you can send them the money electronically somehow so they can purchase it themselves in their region?

The fact that an EU-purchased key is not ROW is not Humble's fault, but the publisher's.
Take Two / 2K is particularly infamous for their draconian region locks where "ROW" = "everybody without a worse lock", with said worse locks usually including EU in some way or another.

Now, I'm pretty sure gift links are supposed to be locked to the recipient's region, though that might just apply to bundles - would make sense, as unlike the store, everybody pays the same price for them.
TL;DR: when buying from a greedy AAA publisher AND from outside the USA, assume keys to be locked to your geographical region, give or take a few countries.

Steam store is much easier to use, as neither region locks nor price are gonna be an issue for EU gifters. You could use one of the following methods:

1. buy them the DLC as a gift: easy and straightforward, can be done with Steam Wallet, but is more expensive, as you'd be paying EU price;
2. buy them a Wallet code: also expensive, requires using real money, and even the smallest amounts are gonna be overkill, especially when accounting for regional price;
3. market transfer method: they'd have to list a unique/rare item that you'll buy - even when factoring in market cuts and currency conversion, it's still cheaper, as it lets you send the exact amount - needs market access though.

Like others have mentioned, the publisher determines region lock. So if the game is region locked it will be region locked no matter which vendor you buy it from.

I don't know about Humble, I haven't bought from them since my horrible experience with their customer support.

Here's a solution that works for Fanatical:

1. Visit the game's product page. If it's part of a bundle then search for the game and visit the page for the game by itself. For example:
   https://www.fanatical.com/en/dlc/borderlands-2-commander-lilith-the-fight-for-sanctuary
2. Under the Add to Cart button it will say "Activates in (your country)". Click View All next to that and you can see any region locks.
3. To buy the region locked game for your friend. Use a VPN and set it to SEA. Now Fanatical will sell you a SEA key. It's not on sale though.

Games are region-locked for a simple reason: pricing in EM
Example: Bordelands 2 full game
You pay US$8.14 in Euros(Bulgaria) vs US$2.36 in Indonesian Rupiah

They don't want to 'lose' a customer from an emerging market because the game would cost him a much larger percentage of his income. It's better to sell the game at a lower price than to not sell at all. We're talking about entire markets with millions of people: there's money there,

However, they restrict the ability from some 'cheaper priced' markets to buy products to 'normal priced' markets to prevent abuse and loss of revenue. Completely logic from a marketing perspective.

However, restricting a 'normal priced' item from being activated into an emerging market country is just stupid. It's literally the best case scenario for the developer, for Valve and the users involved.

Edit: a second reason might be a multiplayer game in which you don't have worldwide servers/ don't want people playing with high ping.

I was quite aware of the Humble Bundle zone restrictions, although it's possible that not all games are like that. I've won games from there that I've given away on SG, but nobody said they've got issues with it as they were not region locked or anything.

Maybe it was with that key particularly? If this process continues, you can say goodbye to SG in a lot of regions. 😖

While I agree that stores should inform you about locks, it's better not to rely on them, especially when you are planning to give the key away.
SteamDB is a great place to figure out how regional locks could be (the website relies on information from the community, so it might not list all packages for new or unpopular games yet). For this case just go to:
https://steamdb.info/app/872280/subs/
There you can see all known packages. The abbreviations already hint on the regions, but to see exact information on all affected countries you need to click each package. For instance this package: https://steamdb.info/sub/372360/ for Asia, including Indonesia (and not whole Asia, because India has its own package).

they already did that wayyy before, either bundle or direct buy
i know because i experience both
and coming from SEA region, we always getting the shittiest, some bundle even remove/change game from ROW. even worst usually just 1 less game and no compensation at all
having reglock still fine i guess, but directly change the game on bundle into less appealing game or just straight up removing games them is the scummiest thing ever (even worst without any cashback, just -1 games but same price)
what gives??? i PAY THE SAME AMOUNT OF $$$, using USD (i pay using paypal)

i see some comments say that publisher itself make reglock, well its true
but HB also publish some game AND they also make them reglock too
usually i found it on bundles

I guess you could also change the location of your HB account in the settings while browsing with a VPN (before purchasing!). Dunno if there are any reports of people getting banned for "abusing" their location change feature.

"not down to humble but publishers"

Well, but the price isnt is it? Thats my issue with humble

When i buy on steam or nuuvem for example im getting SA keys(im in brazil)- but, im paying steam regional prices

In most other stores and in humble when/if i buy im paying the same us dollars as anyone else.
In other stores, when i pay row/default prices i get row keys- except freaking humble.

Thats one of the reasons ive been pausing and getting waaay less bundles now, fanatical often misses me, and im being way more picky with humble

Most sites do this to a degree - I notice it moreso with Japanese games, but a lot of the AAA publishers are greedy-ass sons of bitches, and like to region-lock stuff as well. I don't blame HB, Fanatical or any other site if they can only get region-locked keys. I've seen some nice deals on games on a lot of stores, only to find I can't even purchase them (let alone worrying about region-locks), and that's from someone who lives in a country that almost always gets ROW keys.