Szikar

There is no encryption (as in the case of Proton, for example), but Swiss law is a sufficient guarantee for me.

I use KDrive with webdav and a Linux client. It works great, no problems at all. The speed is noticeably better than Google Drive ever was.

Check out https://www.infomaniak.com/en/ksuite . Swiss-based, reasonably priced. There’s no end-to-end encryption, but that’s the only thing missing.