Earlier quoted context omitted.
It auto-runs all the time. I've got a work laptop with a teams for the work domain which I want. There's also a completely different copy of teams, "Microsoft teams (Personal)" teams, which I have to close. Not just every boot, even after I close it manually, I still find it running constantly. I've no idea what triggers it, but it doesn't seem to obey any startup settings.
Ha, that's another thing that grinds my gears. Teams, Teams (Personal) Teams (new)... WTF people you're supposed to know what you're doing here.
I don't understand why they keep doing this. I guess because the names are recognisable enough that they want them advertised as such for both use-cases, but it is confusing.