I use Teams all the time (although not because it is what I'd choose..).
Mostly just completely free tier, although I do have O365.
On the free tier I think the main restriction is the 60 minute limit on groups > 2?
Don't get me wrong, MS are almost as bad as Google in segregating their chat/video call/conferencing offerings, and even if you did know the names last week, they've probably changed them this week.
No I mean they were recently forced to unbundle by the EU or face monopoly claims. I guess they saw people paid anyway and unbundled everywhere else.