Seems like they are pushing their Edge browser over the edge… - in our company (also totally reliant on MS365), Edge sets itself as default browser after every reboot, no matter what you said before (we also have Firefox ESR as an alternative browser).

Every link clicked in Teams is processed in Edge via some kind of “safe links” checking. They probably sell it as advanced security, but it makes you feel like a five year old, as if you wouldn’t know what you are clicking on…