It's fairly reasonable to discourage people from using random third-party compiled signal variants though. If you can't figure out building it yourself, using the official one will probably be safer.
With fdroid i trust 1 party, by downloading random binaries I have to trust hundreds.
https://github.com/signalapp/Signal-Android/blob/main/reprod...
Why? The official one can be backdoored and with a gag order you would never hear about it
Not trusting signal's build and then turning around and trusting some third party build seems strange. The official build probably has more eyes on it, and signal has more reputation to lose.