Why would pulling game sales from Steam affect your ability to play with your friends or make you buy a second copy of the game? They're not blocking network co

Why would pulling game sales from Steam affect your ability to play with your friends or make you buy a second copy of the game? They're not blocking network connections from existing copies of Rocket League. This isn't a Sony-like move, where they're siloing off players by platform; they're just switching which game store you purchase new copies from.