One thing that would make beeper better than other options (eg self hosted matrix) would be the ability to combine multiple accounts from each service. I have multiple telegram, WhatsApp and discord accounts.
What I'd really like to do (and the poster you responded to) is to connect your app to my own self-hosted matrix-server.
Genuine question. Why do you do this?
Not the OP, but the beeper client looks better and has native GIF support, among other niceties that more "normal" users would prefer over other clients.
I'm confused about the downvoting. This is absolutely what a lot of tech people want to do, use the nice client and self-host.