It's not just Teams. You need to be constantly vigilant not to make any change that would let them link your MS account to Windows. And they make it more and more difficult not only to install but also use Windows without a Microsoft account. I think they'll also enforce it on everybody eventually.

You need to just stop using windows and that's it.

The only windows I am using is the one my company makes me use but I don't do anything personal on it. I have my personal computer next to it in my office running on linux.