

The PC was new. There were only Intels in PCs. Linux was made for the PC.
Backstory: Prof. Tanenbaum was teaching operating systems. His example was MINIX (his own academic example). This motivated one student to try to make a new operating system for PCs, doing some things like the professor, and other things quite differently. This student knew the specifics of the Intels and used them good for performance etc.
ARMs are coming. RISCV are coming. Some Chinese brands have been seen, too.