Take this, for example: https://support.apple.com/en-us/102630
You can trivially disable web access to your data; at that point, Apple literally does not have the keys to your end-to-end encrypted data and cannot read or disclose it.
https://appleinsider.com/articles/24/04/10/apple-makes-it-re...
https://news.ycombinator.com/item?id=42014588