Btw, the web versions of MS Office are completely free when opening files on a personal, unpaid OneDrive via the web interface at onedrive.live.com
The web versions are literally the thing that Teams launches when you share and open documents there. Teams and the US’s obsession with Chromebooks at school are probably the driving factors behind improving Office Web. Benefit for non-ChromeOS Linux users is surely just coincidental (kinda like Adobe Express).