If you want to know more and why the PC market shaped to be like what it is now, this Anandtech article from more than a decade ago is an excellent read:
www.anandtech.com
TLDR: Nvidia and Intel fought regarding Nvidja rights to make Intel motherboards chipsets and about Nvidia having the capability to create an x86 processor (Nvidia does hold some x86 patents from their acquisitions). Ultimately, it was settled that Nvidia couldn't create an x86 processor nor x86 emulator but, in exchange, Nvidia got a welthy sum of money (Quite a lot of money for the size Nvidia was back then).
It was one of the reasons Nvidia kept investing heavily into Arm ecosystem and why Nvidia can't create an Nvidia x86 CPU + GPU SoC/APU.
Another problem is that PC games are made with x86 in mind and nothing else. And Windows on Arm is still in a terrible state, with the Windows x86 application emulator being very meh.
However, Nvidia is rumored to be working on a Arm SoC for a Microsoft Surface product scheduled for 2025. So we might get to see a heavier push and investment into Windows on Arm and, with Nvidia expertise and GPU IP, perhaps PC Games finally being playable on Arm devices. Nvidia did a demo back then that might be a taste of what a ISA agnostic PC Gaming future might shape to be: