[dangus]

Mine does not nag me about OneDrive or backups. OneDrive is not even installed. If I search my start menu for OneDrive, nothing even comes up.

Sure, you can't install Windows without a Microsoft account, but realistically a Mac is far less useful if you don't do the same thing. If you don't sign in with an Apple ID you've got zero iPhone integration, for example. I would imagine that 95% of Mac users are signed in to their Apple ID.

Signing in to an account to use commercial software doesn't seem unreasonable to me. I'd rather sign in to my account than deal with entering a product license key and needing to keep track of it.

I have not been offered Office 365 since after the first install.

There are not adverts on my login screen, it's completely blank. Change your settings.

These sales tactics are not unique to Windows, Mac subscriptions are upsold in the system settings and via notifications. They do go away and stay away but they are there when you buy the system.