There are inter- relationships between privacy and security however. You can't maintain good privacy unless you have a secure platform, and what is the point of

There are inter- relationships between privacy and security however. You can't maintain good privacy unless you have a secure platform, and what is the point of security if you cannot maintain privacy? Eg. Signal fails privacy requirements with the telegraphing of your phone number when you join a public group. There is no need for a phone number to be available to people that you don't know personally. This can lead to all sorts of physical issues (abuse, doxxing, arrests...). It would be better if a phone number was treated as a private piece of information (like SSN, home address) that is not sent out without your explicit interaction.