A totalitarian government blocking a service is a good sign they are unable to break its security and thus use it as a surveillance tool. It's a great advertisement for ProtonMail.
Vizzini: ... they block it because they can break it and want all of their adversaries to think it's unbreakable... Now, a clever man would put the poison into his own goblet, because he would know that only a great fool would reach for what he was given. I’m not a great fool, so I can clearly not choose the wine in front of you.