It is endlessly frustrating that companies have universally decided that they won't let people say "no" to stuff, ever. There are no longer options to reject stupid-ass new "features", only postponement until next time you open the app/website/program. They'll continue pestering you for the rest of your life. I realize that my frustration may be a little over-zealous, but we deal with these interfaces dozens of times per day and this is user hostile behavior. There isn't really an option to just use another service or program, since the entire technology landscape has been commandeered by a few major corporations, and they all enact the same shitty things as a group.
Oh my God it's such a pain in the ass. It spawns like 15 processes that don't die when you close the browser window, and there's no indication which is the master so you just have to kill them one by one until they all die. And the search bar that pops up on the desktop is such tacky 90s spamware... I've never liked Windows but since they launched 11 they've really become intolerable, even the w10 experience is being degraded by it.
* Windows updates can and sometimes do reinstall Edge. The toolbox offers a tweak that can delay feature updates by two years and security updates by four days. That gives you time to review the changes and check whether they'll reinstall this malware again. Alternatively, you could just re-run the tool after any feature update to uninstall Edge again.