I think this is an advertisement, but it’s for a service people might actually want, that doesn’t necessarily cost money, and only asks for money when needed for functionality. It’s also a first-party ad.
copium
I don't think that's what makes Apple's in-OS ads acceptable. Whether somebody "actually wants" iCould or whatever, is dependent on that person. What makes Apple's in-OS ads acceptable are that they are for Apple services that are totally in-context to where you are in the OS: an "ad" for iCloud appears in the Settings dialog hierarchy where iCloud settings would normally be. Also, they are really subtle and hard to notice, tastefully integrated with the OS/color scheme.
Unlike Microsoft's ham-fisted ads that are in your face, thrown into the Start menu without any context, for services that have nothing to do with what you're doing, and design-wise garish and tacky: I'm in the middle of launching a text editor, and Microsoft shouts "BUY CANDY CRUSH LOLOLOLOL" with a blinding ad.
Big difference.
Okay. But can they be permanently disabled?
Windows' OneDrive ads can be disabled, FWIW. There's a switch for almost everything in Windows (which doesn't excuse the shitty defaults, but still).