Windows can be very pushy about resetting the default every now and then. One update a year or two ago opened a full-screen ad for an Edge tutorial that could only be skipped by going into the task manager and force closing the process, and even then unset the default browser and added an Edge icon to both the taskbar and desktop. I wouldn't be a surprised if a lot of people have been bulldozed into taking the path of least resistance.

You're talking Windows users. They already either know they're being tracked and don't care, or who don't know they're being tracked. Why would they care about a different browser?

Fair point. Guess I've been an outlier since the first time I sat down at a keyboard, never been happy with defaults.