Ah, I was meaning "indefinitely" in the sense of "an unspecified period of time" :)
Practically, it's very rare for games to disappear from a Steam library once purchased. It happens for stolen/fraudulently purchased keys (eg keys bought with stolen credit cards), but for a whole game it's very rare.
It has happened, but generally for games that relied on online servers for functionality and the servers have been taken down.
Practically, it's very rare for games to disappear from a Steam library once purchased. It happens for stolen/fraudulently purchased keys (eg keys bought with stolen credit cards), but for a whole game it's very rare.
It has happened, but generally for games that relied on online servers for functionality and the servers have been taken down.