You're probably an iCloud services user. Try a Mac without an iCloud account - it's nagging you pretty heavily to set it up, get an iCloud+ subscription, use TV and Music and Game Center subscriptions, and so on.
Oh please. Unless you’ve never opened system settings and got the device with a user account pre-configured for you, you have been exposed to iCloud several times.
Does it make one especially edgy to pretend to use an Apple device while never having heard the name of their single cloud offering? Whatever floats your boat, mate.
I don't even know what iCloud is, and I have seen zero ads. I don't understand such comments.