Seems like they would need to have a compatible Android fork for this ... anyone know what pieces would need to be carved out and rebuilt for FB to mount a succ

Seems like they would need to have a compatible Android fork for this ... anyone know what pieces would need to be carved out and rebuilt for FB to mount a successful effort? Ie they don’t want this to benefit Google in any way. Or is there some other viable mobile OS they could use? Not obvious to me.