signald is needed for mautrix-signal, the Matrix to Signal bridge, which I intend to package.
mautrix-signal was recently rewritten in Go and does not make use of signald anymore [1], instead it links against libsignal [2].
[1]: https://github.com/mautrix/signal/issues/372 [2]: https://github.com/signalapp/libsignal -- Nicolas Peugnet