It's a chicken/egg problem. There are no games on Mac because nobody plays games on Mac, and nobody plays games on Mac because there are no games on Mac.
Only Apple has the power to break this cycle by throwing money at game developers to reduce the financial risk (same way Epic does to get games into the Epic Game Store for instance).
They're kind of trying to do that with Apple Arcade, but from what I've seen they don't really understand the market enough to make an interesting offering.
It's insane to me that they're failing so badly at it: Apple's amazing at building brands, but gaming is huge with people under 30, and it might get harder to sell people a computer you can't run AAA games on.
Google could have eaten iPhone's lunch with gen Z with Stadia if they invested in it properly, but they didn't manage to make it work
It's not a chicken and egg problem. It's Apples fault/intention.
They had really bad support for OpenGL and wanted developers to use Apple's Metal API.
But developers stayed on DirectX (Windows-only) or OpenGL/Vulkan for Linux/Windows/Android crossplatform.
It just wasn't economically viable to develop for Mac.
The importance of cross-platform 3D-APIs for game development is vastly overrated though. The problems of the Mac as gaming platform are much more "holistic" (but yes, in the end it's about the economical viability).
Only Apple has the power to break this cycle by throwing money at game developers to reduce the financial risk (same way Epic does to get games into the Epic Game Store for instance).