It’t not discouraged. In fact I’d say it’s actively encouraged to fork both the client and the server. What is not encouraged is just forking the client and u

It’t not discouraged. In fact I’d say it’s actively encouraged to fork both the client and the server. What is not encouraged is just forking the client and using Signal’s servers. “I'm not OK with LibreSignal using our servers, and I'm not OK with LibreSignal using the name "Signal." You're free to use our source code for whatever you would like under the terms of the license, but you're not entitled to use our name or the service that we run.“