Our business is a Microsoft outfit. ~90% of our servers are Windows 2019-2022, all our workstations are Windows 10, we used to run on-prem Exchange and even Skype for Business then Lync.
One day I got poked by a Microsoft drone with a notification about them sending auditors our way, to evaluate our license uses and all. A hell of a clusterfuck of a bad time ahead.
Luckily at that stage we had just started a big migration project move off-prem to Microsoft 365 stuff including Teams, and I was able to placate them with a kind of "We're already moving to Teams/Office 365, bad time for an audit, if you force this the only result will be us going to Google Docs instead", and that placated them. (In the end, that's what they wanted after all. everybody on fully controled subscriptions).
We're perfectly fine in the Microsoft ecosystem, but I 100% agree that they will leverage the hell out of their position, just as the other big ones will.
Silver lining I suppose is we're not dealing with oracle licensing.