That’s exactly what I said, each side of the bridge has its own encryption standard (or no encryption at all).

The encryption could be as solid as possible, the problem would remain unchanged: to bridge messages between two services that are not interoperable, you need to decrypt them at some point.

Let’s

Matrix bridges have nothing to do with encryption, they read the messages exactly the same way a client would, and send them to the other side of the bridge exactly the same way a client would.

It’s only for the free tier, and it’s removable, just a little annoying cause you have to do it every time you write a mail.