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Re:Introducing ProtonMail's Tor hidden service by saycheese on Thursday January 19, 2017 @01:18PM (#13438008)
Re:Introducing ProtonMail's Tor hidden service by zie on Thursday January 19, 2017 @05:04PM (#13439881)
Obviously they either 1) lost the PGP key(or other internal issue) or 2) got served with something that won't let them post new canary messages.

something tells me #2 is probably more likely.