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@os_sci
> How can anything which has a recognized foss license be proprietary?
To access the Signal network you are obligated to use the server and apps binaries they offer. If you make use of Freedoms 2 and 3 to fork their app, or Freedom 1 to create your own, and you connect your app to their server, you're breaking their network license. So while the *code* is libre, the network is proprietary.
Does this make sense?
#Signal