It is implied: most people do expect to keep a game if they buy it. There’s no expectation to keep an arcade machine after inserting coins. Everyone who paid for extra lives or whatever powerups should have done so with a clear expectation that the online game that they haven’t purchased will die eventually. Nobody is being duped or betrayed.

Giving it out for free would be nice and probably wouldn’t cost them too much, but it’s also unreasonable to demand something that was never promised. Damn, I can’t believe I’m defending some free-to-play pay-to-win microtransaction online service hell game, but I guess even they can do something right not wrong every now and then.