They went and reported this to the law enforcement agencies, after anonymizing it, and the vulnerability here is simply the user interface wasn't good enough. If you're talking about something really secure and sensitive, it should be really clear to you that this conversation is encrypted.
De rapporterede det til politiet efter at have anonymiseret det, og sårbarheden her er simpelthen at brugergrænsefladen ikke er god nok. Hvis du taler om noget som er virkeligt hemmeligt og følsomt,  så skal det være helt klart for dig at samtalen er krypteret.