Signal sucks
- requires a phone number
- requires you to keep that number, or dox your gps location, to change devices
- unnecessary captcha
- closed source backend
yes, it's way better than whatsapp
but a looong way behind Simplex
Discussion
I don't love it either but back end is FOSS now, I think.
I'd love to see some evidence of that
To my understanding, it's not possible to build/provision your own signal backend
https://github.com/signalapp/Signal-Server
If you do build your own backend, your users won't have #interoperability with most users using the official #Signal servers if I understand correctly.