if you do not comply with court orders of the country you are based in, you can close up shop
This is exactly the case for every VPN and network operator. Some take steps to remediate issues around anonymity, and some even offer ways to pay anonymously, but no company is going to break the law for you.
I have issues with Proton's head being far too conciliatory to Trump, but the email thing wasn't something they could do anything about, because it's an inherent flaw with how email works; it was a court order to which they were compelled to comply, whether they wanted to or not.