“ Ultimately though, if this experience isn't right for you, you can turn off this feature the first time it launches in Microsoft Edge, and then in Outlook settings at any time after that. ”
Having said that, Microsoft seem to be entering another phase of baiting antitrust regulators.
Edge has another funny behavior where if you go to a Chrome extension page, it says you can install the extension. However, Chrome puts a web-page warning over the install button to block it and try to get you to install Chrome again.
It's clear companies value being your default browser.