This is developer keys, this means the game MAY SAY something about being a beta key upon activation. HOWEVER, this is not true, they are FULL RETAIL VERSIONS of the game, they will NOT be revoked and they WILL continue to get updates (if any).

If you want to tell "Thank you" just add Wishlist games:
Convoluted Incident: Pinch me
ONLY UP: MEMOLOGY (3d remastered edition)
Memology: Exam on Streamers
Group with giveaways here