Fuck. For how long has Signal been compromised?
It used to be something I cared about, then I stopped caring, now I care again.
Discussion
There is no guarantee of privacy in any form of communication, as any member of a group can record and share the content of conversations. The only way to ensure complete privacy is to engage in a conversation with oneself only.
That's why the correct approach is not total secrecy but plausible deniability.