Ah, yes. The “let’s bloat our game size to bully other games off your SSD so you’ll be reluctant to ever uninstall it, because reinstalling it would be a big pain, that way you’ll play it indefinitely and give us extra money in micro transactions” strategy.
Modders rarely bring crisp textures which will look good on 4K. I haven’t seen anything myself.
I don’t think I have seen anything of note from AAA developers either. I don’t play every single game that comes out though and mostly focus on things easy to get back into when work keeps me off games for several weeks.
There is a likelyhood that the games I have played weren’t made with 4k in mind even if the game can display at the resolution though.