Am I too harsh in believing that if you claim to have E2EE but I can’t verify a) your source code b) my client was built from that source code (i.e. reproducible builds) then you don’t have E2EE? The whole point of encrypting my traffic on the client is I don’t trust you. Why would I believe you aren’t sending the encryption keys off to your server if I didn’t trust you before?
Which is how we know their self-rolled encryption is shit.
There’s a reason why Telegram CEO can be arrested when Signal’s can’t. Because Telegram has information they can give but refuse to whereas Signal give everything they’ve got, which is basically nothing.