Some GNU/Linux distributions like Plasma Mobile, LuneOS, Ubuntu Touch use libhybris through the Halium project to reuse proprietary Android libraries
See the Mer architecture for more details.
PostmaketOS is probably not using libhybris at all and is instead working with upstream and probably doesn't depend on nonfree libraries
Replicant is currently involved with upstream GNU/Linux, but it would probably be a good idea to collaborate more with distributions that don't depend on libhybris.