I see the booting process is quite complicated. Isn't ARM and PowerPC chip similar enough that many PowerPC linux can be ported over to use the M1 chip?
The M1 boot process isn't really much more complicated than the boot process of many other embedded ARM systems. Linux already works on ARM; everything I talk about here is about dealing with Apple's particular flavor of hardware and their non-standard boot process. That doesn't have anything in common with PowerPC systems either, so there isn't anything to be gained from PowerPC Linux (other than the I²C driver which I do mention).