Proton complied with a court order once (that we know of), no? I have seen a lot of negative sentiment from HN commenters toward them but not a lot of evidence to back it up, particularly when you consider the email marketplace.

It was a legally mandated court order they couldn't just refuse. No encrypted data, the contents of their emails, was handed over. The person would've also been safe had they used vpn/tor as I recall the story.