As an experiment I revoked the certificate that is used for code verification on the executable responsible for the popups. So far the only thing I broke was the .net installer. But no more pop-ups. :D
I run a local account and toggled off all the telemetry stuff during installation nine years ago. Never saw one of those. Didn't even get toggled on with updates. Only problem I had was Copilot getting added a few weeks ago. By that time, Win10 had become the compatibility fallback for Linux, though.
So, create a local account, go into Settings, and toggle off everything that could maybe be telemetry related.