Why would protonmail be responsible for human traffic that happens unbeknownst to them? They don't need to "shield" merely just don't keep any logs so there is nothing to seize. If I go to walmart and buy a trailer with cash while wearing a mask (which walmart blindly accepts) to cram a bunch of illegals in to cross the border, why would that be walmart's fault if they don't have any log of who I am? Are you demanding walmart keep KYC of anyone buying knives, trailers, and anything else that could be used for illegal purposes.