Teams was kept in appdata like Chrome so that these programs can update themselves without admin privileges and I suppose that is how they keep users on a recent version.
Except it completely backfires when you have a workstation with multiple users who infrequently use it. Existing patching solutions, like microsoft's own system center have a hard time coping with applications that live in app data. So you end up with 8 instances of teams on a system. 6 of which are months out of date.
