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And what data would this client be handling via the API?
Even Signal discourages third party apps for this reason you are indeed missing.
Removed by mod
https://www.tomsguide.com/news/fake-signal-and-telegram-apps-sneak-malware-into-thousands-of-android-phones-delete-these-right-now
The signal code is there for transparency and individual use, not for redistribution. Again, this is signal themselves discouraging users from third party apps for things that have and will happen.