Look at the Settings app on your iPhone or iPad. It’s constantly nudging you to subscribe to some Apple service, like AppleCare, or to pay for more iCloud storage because your measly 5 GB is running out. If Tim Cook is this shameless, then ads in Maps are practically old-school Apple by comparison.
We develop for iOS, so we need to register a bunch of Apple test accounts once in a while. Every time an account is registered, you get around 5 emails of ads. WITHOUT ANY UNSUBSCRIBE links.