If you like city builders, Pocket City 1 and 2 are paid touch based city builder games, and both of them are very good. I would also recommend Battlechasers Nightwar, Mini Metro, Meteorfall, Cat Quest, Vampire Survivors, and Titan Quest.

Into the Breach and Moonlighter are also excellent if you have a Netflix subscription, but they require you to log in first to play them.

And the irony about the whole situation is that Reddit is taking the old stance of “let’s sell out our users that got us here in the first place in exchange for an IPO and make some money now.” Dude, if you didn’t have your current userbase you wouldn’t be thinking about doing an IPO because you wouldn’t be able to generate enough corporate interest to support it. And soon at least a portion of that userbase is going to leave because of your decisions.

Yes, you can play Diablo 4 solo, and you don’t need a subscription for the game. It’s a one time purchase. The main map is connected online and is the same map for everyone. You can see other players occasionally, depending on your region server. It’s kind of like Destiny 2 that way.