> WhatsApp does not protect metadata the way that Signal does. Signal knows nothing about who you are.

This isn't strictly true though, no? Signal knows your mobile phone number.

I appreciate that this is for facilitating usability, but its still a piece of metadata that can specifically be used to identify you - and signal knows it. You cant even use signal without verifying a mobile phone number AFAIK.

They really shouldnt be making false statements like this. It undermines their (otherwise admirable) position.