[1]: https://cointelegraph.com/news/skype-wechat-snapchat-thrashe...
No. Signal is GPLv3.
They don't allow third parties to distribute modified binaries that connect to their servers. You can argue if that is a good idea, but don't misrepresent the situation.
The whole spirit of GPL and FOSS is to be able to examine the source, modify it, and distribute it freely. It’s a form of DRM to restrict who can and cannot distribute the Signal binary.
Maybe this is an unpopular opinion, but IMO the fact that Facebook "trust" it means that I have a lot of reserve about using it myself.
(if that's the rule anyway - I couldn't find confirmation for that)
Hence why Moxie doesn't think federation is practical with an evolving communications protocol.
[1] https://matrix.org [2] https://riot.im