Which gets right back around to my point. If you use Signal, but you stick a Matrix server onto it, you have made your data less private.
It’s not choosing between “your phone could get hacked” OR “another admin can see or accidentally leak your data”…
It’s choosing between “your phone could get hacked” or “your phone could get hacked and extra points of failure are added too.”
Matrix bridging is a convenience service, like Beeper was… Definitely not a privacy one.
And it turns right around into my point: aside from signal, there is no such thing as privacy and discord and whatsapp should at best not be executed on your phone. And no, the person using a bridge on a server that is not their own is not the person that correctly sandboxes the app or roots their phone.