[user_7832]

The other HN comment already has some info, but from what I remember from r/android threads, it's because qualcomm doesn't allow unsecure (sic? unencrypted?) VMs, which, ironically, are needed to run nested Linux.

Disclaimer, my memory on the exact terminology is extremely fuzzy. But pixels with tensor can run it just fine. And it's purely a software thing too, btw.