I have removed games

https://www.steamgifts.com/discussion/LS9Hd/orphan-keys-drop-thread

https://www.steamgifts.com/discussion/LS9Hd/orphan-keys-drop-thread

ninjas :O

Look at the top bar on this page and click the second grey button from the left ;)

The games were free in the past and therefore can't be given away here.

Those games were free at one point or another, that's why you can't create giveaways for them.
You can still ask people do do funny tricks for them, though.

Don't forget to write a little code, so bots have at least to work a little

You can't do much.
But you can also ask if anyone wants the copies themselves. (If you do decide to do that, I would gladly take Slaughtering Grounds... I know, I'm shameless. :/ )

I post keys like that in threads where the topic creator didn't add a giveaway of their own.

The first 3 are still free and the rest were given away and are such bad game you likely can't do much with them.