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Re:WhatsApp gives users an ultimatum: Share data with Facebo... by Freak_NL on Thursday January 07, 2021 @09:12AM (#25671199)
You're right about Signal having an open source client of course. It's a closed platform because of the 'no-forks-allowed' stipulations.
Re:WhatsApp gives users an ultimatum: Share data with Facebo... by Bit32 on Friday January 08, 2021 @11:43AM (#25686513)
The main reason for not wishing that Signal is forked revolves around adding new features. It stops things being fragmented.

As both the client _and the server_ is open source though it's entirely possible to do things like Signal<->Matrix bridges.