One downside of protonmail is that they don't provide access via IMAP, so once you migrated it would be hard to back up your emails or leave them for another vendor.<p>They apparently now have a beta of IMAP access though: <a href="https://protonmail.uservoice.com/forums/284483-feedback/suggestions/7180858-imap-smtp-tls-support?tracking_code=017f0a56f118f5c74289c5ba64cb3281" rel="nofollow">https://protonmail.uservoice.com/forums/284483-feedback/sugg...</a>
My question is always the same (as a protonmail user): why don't they open-source their android app? There aren't reasons not to do so.
For example I wanted to improve their app adding a feature in the past, but I can't
While they are hosted in Switzerland they are staffed from the US iirc so if you are worried about state survielence don't count on geography to save you.