Well to find out for any game you can start making a giveaway and see if it shows up when you try to enter the title. If it doesn't show up (especially if its old and bundled), then it's probably on the free list and can't be given out.
Nosferatu specifically is, and you can get a list of other ones here https://www.steamgifts.com/discussion/pJRbR/can-we-have-a-list-of-games-that-cannot-be-created-as-giveaway-unofficial-list-inside
Comment has been collapsed.
https://www.steamgifts.com/discussions/search?q=nosferatu
Limited, uhu. Think it been free several times.
Comment has been collapsed.
1,181 Comments - Last post 13 minutes ago by NeStric
21 Comments - Last post 31 minutes ago by nogphille
21 Comments - Last post 33 minutes ago by FranEldense
2,656 Comments - Last post 54 minutes ago by MeguminShiro
16,859 Comments - Last post 57 minutes ago by Inkyyy
391 Comments - Last post 1 hour ago by kiseli
6 Comments - Last post 1 hour ago by pb1
64 Comments - Last post 1 minute ago by Carenard
1,160 Comments - Last post 1 minute ago by IronKnightAquila
1,573 Comments - Last post 2 minutes ago by A10i
197 Comments - Last post 4 minutes ago by Prosac
85 Comments - Last post 4 minutes ago by Boson
152 Comments - Last post 6 minutes ago by erom96
177 Comments - Last post 18 minutes ago by Metalhead8489
Is it allowed to give away a game which was free 2 years ago? (but only a limited number of copies)
Here is the website where the keys were given:
http://www.epicbundle.com/article/steam-key-for-free-nosferatu-the-wrath-of-malachi
Comment has been collapsed.