Well, regardless of one rant, MS's cloud content management (OneDrive, Teams) is based on SharePoint, which is in turn based on SQL Server. MS has at least partially bet the company on SharePoint Online; it has to be datacenter grade now. Maybe it wasn't at the time of the rant, whenever that was.
I still don't fully understand what it is, but the best explanation I've found so far is
https://www.youtube.com/watch?v=TE9TpraPlrE (albeit 9 years old now).
Regards. Al
"Violence is the last refuge of the incompetent." -- Isaac Asimov
"Never let your sense of morals prevent you from doing what is right." -- Isaac Asimov
Neither a despot, nor a doormat, be
Every app wants to be a database app when it grows up