@danhampl If a GMail user explicitly WANTS to give the access to his emails to a third party, in order for the third party to analyze his emails, he CAN give them this access. WITHOUT giving that third party his password. What's "insecure" about that? If someone gave that access and didn't know what he was doing, then he is stupid. The original WSJ article has absolutely nothing to do with what ProtonMail Bridge does.
@fuxoft this is, of course, absolutely true, I agree. There are users using third-party email clients where the password is required (desktop/mobile: Thunderbird, Outlook, AppleMail, Spark, AirMail). This can not be done by ProtonMail without Bridge. To maintain the security of ProtonMail, then, either official applications, Bridge or Web access (always encrypted). However, if someone gives their access information to someone else, the whole security is gone, without discussion (he is stupid).
@fuxoft and we're talking about encrypted communications here. If the ProtonMail user sends an e-mail to a non-encrypted service, the advantage of encryption is also gone.