What makes you say that? I mostly play single-player games where I just buy a game and then play it. There are loads of those out there, with more released every week. Even with my underpowered Linux laptop I have plenty to choose from.
But I guess they're harder to find/more rare. As others mentioned, most people spend nothing to little on these "free" games, so as a no-spend gamer you can choose between 1) free, or 2) pay $10 (or whatever they charge) to play a game. Not necessarily a hard choice if the "free" game is "entertaining enough".
If you're looking for a game to play on your commute it's probably not going to work, but for at home on the couch it's great.
I still plays Diablo 2 and 3 quite a bit. I don’t think I’d call myself a “hardcore” player — I’m not very good — but I’m definitely in the Diablo 4 launch demographic.
I’ve been keeping an eye on Diablo Immortal as sort of a canary. I can say with absolute confidence that I won’t be buying D4 at launch if Blizzard doesn’t fix the DI mess.
Among longtime players of the franchise, I can’t imagine that I’m alone.
it doesn’t work for the developers. obviously you can play a single player video game.