add DOTA 2 to the list so we can give it away

filter :D

You'd be surprised, most of the people who don't have it / want it just aren't regular Steam members and/or aren't connected to any big Steam subcommunities. Two of my real life friends (only have 3-4 on Steam) didn't have it and both took some of my copies.

I'm saying this, but I don't mean it to be relevant to the OP's question

3 friends of mine who doesn't use SG want the game. Are you willing to give those copies away?

Exactly! I don't understand why he wants to give it away in the Giveaway function and make the site slow like before. What is the difference if he gives his copies in the forum/reddit? He is not after contribution value, so i don't really see a difference.

Ithink the problem is, that Dota will only show up in the list of games you own (aka your Steam library) when you have installed and played it.

BUT if you have only the spectator client (and installed and "played"), it will also show up as Dota.

So you see, Steamgifts has no way of really determining if you own / don't own Dota, because Valve decided to not properly update the library.
If Valve cared, they would have made 4 library entries (Dota test, Dota spectator, Dota beta, Dota full).

The problems could be
a) people with spectator client can't enter Dota giveaways
b) people with Dota could enter Dota giveaways, if they havent played the game yet
c) people that won Dota and haven't played it, could be reported/suspended for "not activating" the game, even if they activated it