For starters, I emailed Protonmail support.
Here's mine: Hi, Your homepage reads "By default, we do not keep any IP logs..."
This language is soft and misleading. Maybe in 2018 when I first began using ProtonMail it was good enough. But in 2021 it's not. I expect better from ProtonMail.
Replace immediately with something clearer. "By default we don't log IP, but may be required to by law enforcement. We recommend all customers connect through Protonmail through Tor. This month, 60% of our users connected through Tor".
If you can't come up with anything better for users, just fall back on your privacy statement verbatim and avoid any marketing language.
Think about a journalist in Afghanistan, a whistleblower in the USA, or a human rights activist in China. They're all engaging in potentially dangerous activities.
I advocate on behalf such people by supporting services like Protonmail with my money. If Protonmail isn't supporting these users, why should I bother supporting Protonmail?
I expect Protonmail to educate users like this about how Protonmail itself can be turned into an adversary. Educate users about how to use Tor. Do better. Improve the internet.
I look forward to your reply.
Also, registering a new account through Tor requires a phone number for verification, even though Proton says no unique identification is required to register. If this requirement isn't removed by the time I renew my account I will no longer renew.