You buy a game. Every time you start the game it phones home for permission. The company decides to shut down the server that gives permission. You can’t play the game anymore. If this is like other initiatives in the same vein it won’t stop the game maker from shutting down the server, but it will mandate that they either open source the server so you can run your own, or build the game in such a way that you can still play it (maybe single player only) after the server is gone.