Disclosure: I used to work on Google Cloud (but never on Workspaces née GSuite itself).

There are plenty of companies with tens of thousands of employees using GSuite [1]. Also various governments, agencies, regulated industries and so on.

A few years ago, GSuite added improvements to Office importing (primarily Excel and PPT, IIRC) that assuaged a lot of folks. Companies still might have departments using Office (e.g., Legal still using Word for its redlining or Finance using Excel) but because you can shove them all in Drive or import them into the GSuite equivalent, most of the company happily uses GSuite for everything else.

[1] https://workspace.google.com/customers/

I've worked in 3 companies with the classic Silicon Valley starter pack consisting of Slack, GitHub (not part of Office 365), and GSuite, and found it overall pretty good! What features did you find missing? Personally I shudder at the thought of using SharePoint, it's the worst designed product I've seen.

Never seen a silicon valley tech company on MS office products. Airbnb, Coinbase, Dropbox, Lyft, Uber, Facebook etc use Gsuite, slack, zoom.

MS teams only comes up when you talk to lawyers, accountants etc more legacy or enterprise companies.

I’d think there is something wrong if I see a tech company on MS office. Either they are clueless or they want to save costs.

Facebook has an O365 license; managers definitely use Outlook e-mail & calendar to its full extent. ICs rarely check their e-mails.