this has always been the case even with physical media. i'm not aware of steam ever removing games from their site that would interfere with your ability to continue playing the game. also, you can just "pirate" the game if necessary. it's not really piracy if you purchased it. of course online only and live service game support can be ended by the creators, but usually people figure out a way to setup private servers and shit. in summation, this is an absolute nothing burger.
United States