Your litmus test of 'is used to hurt people' is completely true of web browsers and email too.
Emails are always coming up in court cases etc. as people regularly use them to organise or discuss criminal acts, and it is sometimes used with E2E encryption so nobody can intercept and police the contents. I'm not convinced you've drawn a clear line. When is a protocol client responsible for the content shared or accessed with it, and when is a client not responsible for it.
Emails are always coming up in court cases etc. as people regularly use them to organise or discuss criminal acts, and it is sometimes used with E2E encryption so nobody can intercept and police the contents. I'm not convinced you've drawn a clear line. When is a protocol client responsible for the content shared or accessed with it, and when is a client not responsible for it.