I’m currently using iCloud. It’s great, but the E2EE comes with the huge caveat that they scan your photos before encrypting, against a giant unaccountable database of hashes for bad stuff.
Even though I totally believe that the current set of hashes really does represent truly horrible stuff, I also suspect that it will expand over time to include anything that threatens those in power. In other words: they are coming for your Bernie memes.
So I would like to have a more secure option that doesn’t depend on the whims of the powerful to decide which images I’m allowed to own.