> Swiss privacy shield which is basically a more strict version of GDPR

That's not true. I'm talking about consumer rights. In fact, last I checked (about 1 or 2 months ago), Data Portability Right doesn't even exist in Swiss laws, but it does exist in GDPR and the California Privacy Act.

Protonmail is all built around the Swiss bank image of "your data is as secure than your money". Protonmail doesn't even offer IMAP for free.

If you agree with their methods, no one will stop you to use their services. But again : they do NOT comply with basic consumer rights common to other providers, and I wouldn't recommend them to anyone I know