"I am sorry to have confused everyone else reading this as there were two different category of giveaways. The October 11 graduating group of 4 games and the Squadron 11 Prologue. Like I mentioned above it's just weird that there is a key given away for the same game you could probably just grab off steam. So yep I might be wrong but still it's a waste of chance to be entering for that key

"
Any free game on steam once deleted from steam it cannot be re-dowloaded somehow EXCEPT if you had it with a key or from a curator. Prologues sometimes get removed when the game comes out but it's less frequent than demos. Regardless if someone wants to keep it "forever" (as long as steam is operative anyway), a key is the only sure option. To most this doesn't matter as if you liked the prologue so much you are gonna grab the game.. But people being people some like to have full libraries.. I on the other hand activated this as I had nothing else to do with this key xD
I wanna go off topic and stress out how important it is for steam to make demos mandatory.. But this is not the topic for it
BEEP xD
Same goes for the "moderation" here..