@EdwardTorvalds I'm using signal on e.foundation ROM (MicroG) all the time and it works perfectly.
MicroG cannot be installed, as it requires a patch to fake Google signatures. This patch is rejected for example by LineageOS, which is why there's a separate fork of Lineage with MicroG integrated https://lineage.microg.org/
@kravietz very few devices are supported
That's the problem of virtually every degoogled Android out there - maintaining support for devices costs money and few people support these projects.
This is largely a philosophical discussion - a patch that fakes a digital signature is certainly not something that looks good from security point of view, but that's only if you ignore the whole business context (=Google enforcing its monopoly with Google Services) and the patch has a very well-defined and limited scope.
@kravietz I cannot install microG on my rom. Not supported.