after the edge update, when i started my computer, edge opened itself and forced me through a "first run" mini tutorial thing that i couldnt skip or ignore. it wasn't even a "you have a new program" prompt, it was a "YOU ARE USING EDGE NOW".

one of the updates most certainly was not just a mime handler update. They pushed a new edge (when they swapped to chromium) and rather than leave people with old edge as their browser, they just flat out set new edge as your browser without checking what you had otherwise, and set it to auto run on your next boot.