Alright, now I'm kind of confused...so can anyone here explain to me this particular thing:

If it's marked as "no value" it has probably been given away for free (either on Steam itself or some site) at some point

It was given away for free on Humble Bundle a few years ago (on 2018-03-26). That's why.

Has no value refers to the amount of CVs awarded to the person making the giveaway. Your game does cost $30 and does have very positive reviews, but it was also given away for free at one point (March 26, 2018 though so quite long ago) so according to the rules of steamgifts, it does not award any CVs to the person making the giveaway.

So games are being tagged as "no value" simply out of the fact that at some point somewhere there might've been a free giveaway of them on some sites/services? Is that even trackable? I mean, Steam/GOG/Humble/etc often do Holiday sell-offs and discount periods, but how can you tell/where can you read when/if a game was ever given for free on any digital distributing platform?

Either way, I guess this means that I was mistaken in that I thought initially that the game is getting "value" rating on this site by it's sheer quality/playability/popularity merit, so I thought that the game in question was deemed as having "no value" because locals didn't like it on a personal level, or something like that. But if that's not the case and games get "no value" treatment only if they were ever given for free before, not because they're "bad" or "good", or "worthy"/"unworthy", then I guess that's fine. Anyway, thank you everyone for thoroughly explaining this particular moment to me.

Thank you all once again for all of the clarifications.
I guess I was really worrying for nothing and it was just my mind cockroaches messing up with me once again (which isn't rare due to my tendency of overthinking things when I read/hear something that's not 100% super-clear immediately). A cost of being a hardcore gamer.

As others have mentioned, as far as the winner is concerned, it means nothing. You get the game when you win, regardless of current or past sale price. That's it. You don't get any sort of score beyond "did you redeem it on your linked account?"

As for the creator, they get a score (which determines overall level) based on prices of the items being given away. If they give away a game that they bought for $30, but it (ever) went on sale for $5, the creator only gets score for $5 (and when they create the giveaway there will be 1 red star next to the game title to denote "reduced value"). Even after the giveaway is over, if that same game goes on sale for $1, that creator's score for that game will now be $1. If the game was (ever) given away for free, either by Steam itself or by one of the major key sellers (Humble, Fanatical, etc), then the score also counts as 0. When creating one of these giveaways, the title will have 2 red stars next to it so the creator knows they're not getting any score for it.

If you're ever uncertain about an item, you can look on SteamDB. For example, here is the page for Haegemonia: The Solon Heritage: https://steamdb.info/app/294790/ ... If you go to Prices (on the left side) and then sort by "Lowest Recorded Price", you will see that at some point it was on sale in Argentinian Pesos for the equivalent of $0.08 USD. This means if you create a giveaway right now with that game, you will earn $0.08 worth of score (when it is marked redeemed). It is possible that in the future it will go on sale for even cheaper, at which time your score for each of those giveaways will be adjusted, and your overall score will go down because of it.

Oh, and in case you were wondering, the score is not an exact 1 to 1 for price, but the price does affect the score quite a bit. Other things also affect it, such as your current level, and how many of that specific item you've given away in the past. I've bought many bundles at this point. I'm currently averaging 1 or 2 regular bundles (aka bundles that I know exactly what I'm getting) plus 1 or 2 "mystery bundles" (aka bundles with randomized contents that I don't know what I'll get until I've already paid for them) per month, and keeping around 1/2 of each. I've given away games worth way more than $500 (the requirement to reach level 6) if you go by normal prices. However, I bought the bundles at vastly reduced prices, so it's only fair I get vastly reduced score because of it.

Just dropping in to praise The Darkness 2, it's a really cool, fun game!