It looks like some folks have made it work on linux: https://corellium.com/blog/linux-m1

For Windows support, I thought Apple said something along the lines of: "If Windows wants to add support, we are fine with it" - but I could be mistaken.

Native Windows on M1 would be interesting. But it could potentially embarrass all of Microsoft's hardware partners as well as Microsoft itself (cough, Windows On ARM). Also the market for it would probably be measured in whole handfuls. So I don't think we should hold our breath.

Parallels and ARM windows runs surprisingly well, even for intel windows applications.