Also forgot about this >
https://en.wikipedia.org/wiki/Coreboot
Coreboot is a very powerful open source firmware designed for PowerPC, x86-x64, RISC-V & ARMv8 that can replace whatever proprietary BIOS firmware in the system and allow it to boot say Linux or any other operating system. Theoretically we could create a non-Apple Silicon system using this with say, a ARMv8 PC or a new RISC-V PC.
As far as physical hardware goes these are some of the newer specs emerging
>
https://9to5linux.com/star-labs-unveil-their-first-amd-powered-mini-linux-pc-with-coreboot-support
The Framework modular laptop is another good one (where parts of the system can be replaced by user)
>
https://frame.work
As it goes I'd heard Intel actually has invested billions into RISC-V architecture. It could well happen in future that
we could be running a hackintosh that is possibly ARM-based but still made by Intel.