Also important to note, ADP is opt-in currently.
Warning: this blog post has meaningless marketing-speak. It starts by saying Android is about choice but instead of announcing the ability to set your own backup provider, it just says how Google's Android backup service works, which is wholly unrelated to that first sentence.
If you are talking about other data, Google don't have it encrypted even today.
Not end to end: https://www.wired.com/story/apple-end-to-end-encryption-iclo...
https://support.apple.com/guide/iphone/back-up-iphone-iph3ec...
https://support.apple.com/guide/icloud/view-and-manage-backu...
Does or should grandma care? No.
Should a political dissenter living in an oppressive regime think twice? Yes.