After ProtoMail gave a climate activist’s IP address to French authorities under court order, the individual was identified and arrested shortly after, writes Campbell Kwan.
Here is the link: https://www.zdnet.com/article/protonmail-ceo-says-services-must-comply-with-laws-unless-based-15-miles-offshore/
You can find a blog post by Proton founder and chief executive Andy Chen here.