@anarchoN3rd Any mail provider is subject to the laws of the country in which they operate and host. I blame Swiss legal authorities here more than Proton.
Self hosting is a challenge, but some solutions exist to make it easier such as https://arstechnica.com/gadgets/2018/12/review-helm-personal-server-gets-email-self-hosting-almost-exactly-right/ Big providers like Proton handle much of the admin that some of us are a little too busy to deal with. Email can only ever achieve certain limits of privacy. Other protocols are much better.