> "Do you think Windows OS is a profit center...?"
The consumer editions are not all there is to Windows. Nearly every seat of Windows 11 Enterprise used in corporations is a paid license and there are a lot of corporations. Nearly every instance of Windows Server is a very expensive paid license and is required to run Active Directory, MS Exchange, SQL Server, etc.
I have no experience with Windows Server or Enterprise and don't know anyone who does. Forgive me for omitting "consumer" from my description. Yes, I mean consumer Windows.