Apple dropped support for 32 bit binaries, then migrated from Intel to ARM architecture, breaking backwards compatibility in major way. This led to the inability to run the absolute majority of the existing library of games on the recent Apple hardware and OS.

Unlike the devs in the Apple ecosystem who are used to be on the constant treadmill of app updates to accommodate Apple constantly breaking and changing things with every release, this is incompatible with the gaming industry release model, where after the patch cycle the devs can move onto the next project and rely on the backwards compatibility to trust that their released games will keep running for years and decades into the future.

So when Apple broke this unspoken agreement, the game devs have simply left their existing games in whatever broken state they were, and decided against releasing their future projects on macOS, supporting which wasn't financially viable in the long term, given the time needed and the relatively small percentage of playerbase which uses it.

Blizzard hasn't released a new game for macOS since Heroes of the storm back in 2015 and valve has pulled support for Steam VR on mac and won't even bother updating most of their games to intel 64 bit binaries in order to get them working even under rosetta. Also, they won't release CSGO2 for macOS, proton is not supported on macos nor do they have any immediate plans to update steam to a universal binary for AS macs.

This is a fairly typical example from 2 years ago: https://www.vintagestory.at/blog.html/news/dropping-official...

[edit] although for context this team rolls their own engine. If you’re using Unity or Unreal > 5.2 (May 2023) things are slowly improving.