No, because I see no point in switching from some commercial services from a company to other commercial services from another company. I host what I need as a

No, because I see no point in switching from some commercial services from a company to other commercial services from another company. I host what I need as a service, I run locally and sync the rest. Even if Proton act as a friendly company, it's still an enterprise witch have the job o making money. They are less close than their direct competitor Tutanota, so with them you can pull your data for a local automated sync with JMAP (at least for mails, I do not know if they offer {Card,Cal}DAV for the rest) but that's is. They are as hard a Alphabet to get data synced (not punctually exported), Alphabet offer a buggy non-standard IMAP, offer a broken cardav API, they offer a homegrown IMAP version. In practice it does not change much. You want to own your data? Buy a domain name, keep a relay personal mailserver, if you need a webmail choose one (Mailpie, Modoboa, Roundcube for instance), run OwnCloud if you like such web-centric model. Most of the west world have FTTH connection with more than enough upload for personal usage. You emails for antispam cab be hosted also by Google if you want, but on your transferable domain, and you have all the infra at home, if a service start to be bad you switch transparently for yours correspondents.