But reddit is a proprietary platform, not a protocol. What I was getting at is that NNTP and SMTP (and the infrastructure surrounding the protocols) is all sta

But reddit is a proprietary platform, not a protocol. What I was getting at is that NNTP and SMTP (and the infrastructure surrounding the protocols) is all standard and non-proprietary, nobody owns them and anyone can run them so there can be as many communities as may be interested.