I have a handful of endpoints, used by staff that represent a low level of risk, that use Firefox for that precise reason.

But really, we have a couple of million enterprise end-users, some of which surely using Edge. If we as much as move a button without telling them about it three months in advance, it's the end of the world. In 10 years time, no customer has raised it.

Edge: Chromium with Google Chrome-like data collection, but with data going to Microsoft instead.