I'd think there are a LOT of interest behind closed door wanting to shut down projects like proton.
If you're a criminal that has nation state actors after you I'm not sure what service I'd recommend. For most every other person Proton is way more than private enough.
https://proton.me/legal/transparency
I think I'm with some of the other commenters in that there seems to be an oddly smelling smear campaign against them right now.