To add to this, I believe Signal is open source and has reproducible builds so its chances of getting away with mischief on a large scale are much lower than Fa

To add to this, I believe Signal is open source and has reproducible builds so its chances of getting away with mischief on a large scale are much lower than Facebook's / WhatsApp's. Even if you (weirdly IMO) think Whisper Systems is less trustworthy than Facebook.