But Apple now has Advanced Data Protection that add E2EE for majority of iCloud data and they only keep keys on your devices. Not that I have absolute trust in Apple, but Google don't even have that.
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...