Legitimate question, as most people see this as hosted on a server somewhere and your client doesn't sync with other clients... usually! You do, in fact, have

Legitimate question, as most people see this as hosted on a server somewhere and your client doesn't sync with other clients... usually! You do, in fact, have a client capable of working without a central server. It's tedious but sending patches over email is definitely one way to make it work without relying on a single system. You can also have and push to or fetch from multiple servers with your client, which can be other developer's own servers, or a server reachable over Tor as a hidden service, etc. It's very flexible if you want to go that path.