The scariest part of this recent news is that TM Signal seem(ed) to be interoperable. People using TM Signal could interact with actual Signal users, and the conversations could be archived.
Is there a way to verify/ enforce users in a group are using the official Signal client?
It’s actually possible in a way:
https://en.m.wikipedia.org/wiki/SafetyNet
But you necessarily need to limit the devices and operating systems that are allowed. No custom ROMs, no root access, etc.
It’s bullshit and breaks open computing as a concept.
Fuck Safetynet and Play Integrity.