While on dread recently I stumbled across this old post regarding issues with their onion adresses https://encryp.ch/blog/disturbing-facts-about-protonmail/

When a user makes a new account with Protonmail on TOR they are re-directed from Protonmail’s “.onion” to “.com” address. This breaks your secure encrypted connection to their onion address, enabling your identification. There are absolutely no technical reasons for this feature. In fact, the only other websites that operate like this are suspected NSA/CIA Honeypots.

Change your route, people using tor with the same exit as you are doing too many username checks.

that sucks, this means no more hiding metadata. However, they aren't ditching switzerland (yet) - this only happens if the government applies the new surveillance rules which is not set in stone yet.

I use pgp and host mail myself. It's not as hard, and it's by far less problematic than a lot of people make it out to be. Don't trust hosters.