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You highly misunderstood what happened.
No matter what mail anyone uses the outcome would be the same. There is no such thing as bulletproof service.
The only thing that Proton passed is the IP address and this is activists fault. Even if he used ProtonVPN on their free tier this would have been avoided because under Swiss law they can't force VPNs to log IPs but they can do that for email services.
By the way, Switzerland is as good as it gets in terms of privacy laws and even then they were forced to log the IP address, in other countries it's even worse.