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If you need an account to play it, it's just not yours to enjoy it.
Same with games. One day a purchase vanished off my PlayStation library, and I must have deleted the email cause it was an old purchase. I still have the save files but they won't refund or give me back the game cause it vanished off their records
I'm quite happy that at least steam doesn't wipe (as to my knowledge) a game from their servers, yes they can remove it from the store front, but if you bought it you can still download and play it
Doesn't steam allow you to pick a specific update for your game?
As soon as someone can't be bothered patching Bonnie Tyler out of their 2015 Unity game, you can start expecting games to disappear from Steam's servers.