On the ARM front, MS launched the Surface Pro X last year that runs on an ARM chip they developed with Qualcomm. It is way behind M1 in terms of performance and battery etc but its the same kind of idea - fast ARM based ultraportable with emulation for non-arm apps. So they do at least have a 'dog in the race', even if its a slightly lame dog at this point. I imagine they will be throwing increasingly more resources at ARM in the future.