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.
TBH, I suspect it will only be good for MS to unbundle it.
Of course, I wish they'd unbundle the whole suite. I am never ever going to run the Outlook, Access + whatever that I am forced to install to get Excel and Word.