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When people say free games, it means, some sites given free keys?

Yes. Precisely that.

Is that reason for he not in list?

You're on a roll here. Correct again, my friend.

I say that because i saw culling cow dlc here, but only the dlc, and the main game not, he is free to????

I don't recall the DLC ever being free, but sometimes people like to set the free games to the wrong title to make giveaways (please don't do that.), so that could be the reason.

And another question is, if i put a gift that be iin promotion on steam hes value is be low correct? I must wait for he comback to full price??

You get the full retail value on Steam as CV, not the sale price (unless it goes below 90-95% off, then it gets bundled)