> I dislike Dropbox for reasons that aren't technical, but the big thing for me is that I want either E2EE, or control/ownership of where my data is stored.
You could run something like Cryptomator on top of Dropbox:
It even has (paid) iOS and Android apps for mobile access.
Boxcryptor used to be amazing for this till they got acquired by Dropbox. Last I checked cryptomator couple years ago it still hand random file corruption risk, is that still true?
For now I just use hetzner storage share.