A large state corporation in Brazil is currently trialing 800 Linux PCs. If successful, it will deploy and replace 22k Windows installs, comparable to the migration happening in Germany.
Google workspace has a fraction of the functionality. At a base level they're relatively comparable. But once you go into more advanced functionality and security, 365 is a landslide better.
In terms of the basic office utilities like text editor, spreadsheets and so on, Google is a good contender. But Google Workspace isn't even close to the functionality IT admins have with Microsoft Defender, Intune, Entra, Purview, and so on.
There's a lot more going on at the administration side than just the user's experience, that could make it less ideal to move to Linux.
I'm saying this as someone who hates both Microsoft and Google.
I'm work in IT as a support specialist that manages computers for about 30-40 people and we don't even use those tools like Defender, Intune, etc. We can definitely make the switch from Windows to Linux. It's not impossible, especially when you have someone in your company who knows enough on how to self-host and use Linux efficiently.