I'm curious about this, as a Windows 11 pro user, myself. Do you already have a Microsoft account, use OneDrive, and pay for Office 365?

I have a microsoft account but I use a local account for Windows 11. I always had MSDN and had a pro key so maybe its an enterprise thing. It is a legit copy. I don't use onedrive or 365. When I go to Accounts it has a blue button to Sign In, so maybe local accounts don't get ads.