Hate to break it to you, but "swiss security laws" don't mean jack if your outside of Switzerland. In 2022, ProtonMail Complied with 5,957 Data Requests from the FBI. See here.
As a Swiss national, please don't blindly believe you're immune because it's Swiss and that the Swiss law has got you covered. Swiss companies are just as shady as American ones.
You know at this point, I wouldn't be surprised if reddit had bots to discourage users from migrating. Everytime theres a post about lemmy and other fediverse stuff it gets bashed into oblivion IMMEDIATELY. Most of the stuff those comments say are things like "Its buggy" "It's empty". I've had zero issues with bugs here. And yea, seeing that last pinned post by the lemmy mods, if lemmy was empty before it definitely is not anymore.
Alternatives to Proton? Maybe check out Tuta Mail and Mailbox(dot)org from Germany if you haven't. Both freemium and privacy-friendly :)