> Finally WSL2 will be distributed with Windows which raises some licensing questions (IANAL) if not in the letter of the GPL license at least in spirit. I write GPL'ed software myself and I would be somewhat miffed if I saw my software used in a similar manner (i.e. "via a VM", but still distributed with non-GPL code).

Mere aggregation of non-GPL code with (“distributed with”) GPL code expressly is consistent with the GPL, it is contrary to neither letter nor spirit of the license.