I did not anticipate this, because I figured they’d have learned from Lavabit and designed their systems such that there was no way for them to have any metadata (user’s IP address, user’s ‘user agent’, timestamps of users’ correspondence, pretty much everything except what is required to send and receive messages). Any information your system has, however briefly, can be the subject of a government order.
My issue over the years has been that both Protonmail and Tutunota send you the JavaScript used to “end-to-end encrypt” your message. At any time, they could be ordered to modify that JS to cache the encryption keys for later reuse by government agencies.
So what's the point of still using this mail provider then? I'm relieved I never used my account there much and didn't fall for the fake promises of purported "security".