If you want an optimal teams experience download edge and run the webapp in it.
https://www.omglinux.com/the-official-microsoft-teams-app-fo...
https://office365itpros.com/2022/09/19/teams-pwa-linux-clien...
Others (and this is entirely valid in my opinion) see and notice and decide to ride it down all the way to the ground; this can be valuable also as a dying company is likely to promote anyone who remains; title inflation is a real thing.
Or another way to look at it - it's kinda extreme that a single straw would break a camel's back.
Note that it doesn't even have to be malicious at all; it's just a sign that the company is switching from the company you started working at to something else. Not everyone is up for that kind of change. Imagine the difference between working at the plucky startup trying to do X and working at any of the huge companies those startups can become.
Imagine if there was a company policy that made your office annoyingly uncomfortable after it was totally fine before. Is it extreme to consider other options?