I've wanted to dump GA forever, but it was only a year or so ago I finally took the plunge and set up Fathom analytics on my sites. Now I'm happier with the faster load times and the ability to control my own analytics data (though some of it is more limited since no cookies are used)... but I do have one more small VPS I'm maintaining pretty much in perpetuity (eventually it'll move to a personal K8s cluster but resources still cost a little).
The friction is just great enough that most people still stick with GA, since it's already pretty much everywhere.