Google has end-to-end encryption for some major services, but that’s beside the point I think. I don’t foresee iCloud Advanced Data Protection being worth recommending on Privacy Guides as a standalone tool we point to and say “use this for privacy,” although if you already use iCloud I’d certainly encourage enabling it.
In summary, Apple offers better privacy for the masses, but not necessarily extreme privacy.
I believe that client-side encryption (not E2EE) is only available for the workplace suite. However, since Apple is currently the only “big” company that offers end-to-end encryption, their example may compel other companies to implement similar features.