MS Teams is such a weird bit of software. Join a meeting with 70 people but you aren't muted by default.

I don't have permission to see the chat, but I do have permission to admit absolutely anyone into the meeting.

@eviljonny it's entirely thrown together, so they can undercut slack by offering teams 'free' to enterprise users as a no-cost add-on. About the only positive thing I can say for it is the PWA works very well on linux (by which i mean works the same as it does on windows pretty much.)
I don't hate it as much as most people, but that's probably because I don't love slack as much as most people weirdly seem to.