Beeper is just a reskinned Element messenger. The devs behind it are also the ones who built all the bridges everyone uses.
Beeper users who message other Matrix/Beeper users it should be fully e2ee as it’d be no different from using Element or another Matrix client.
But, it would be nice to get more clarification at a high-level as to how they handle the message relaying.
For sure, email is an insecure means of communication. But, that wasn’t the request of the OP. They’re not asking for an e2ee messenger recommendation, but thoughts on PM. And I provided an honest suggestion that they simply cannot be trusted, regardless of whether or not they complied because “it’s the law”.
Agreed, hopefully i2p adoption ramps up.