Couldn't you make the same argument about email? It's an open protocol but anyone can block you.
Even though that's the case, I think email is much more open than WhatsApp or Signal, and a big part of that is the fact that it's a federated open protocol.
Even though that's the case, I think email is much more open than WhatsApp or Signal, and a big part of that is the fact that it's a federated open protocol.