How well did the mobile port of LCS do? If it didn't meet their sales expectations, it's entirely possible that they probably figured nobody would care about VCS and that it wouldn't be worth porting.
I am thinking the same thing.
GTA 3,VC and SA had 1M+ download on playstore.
GTA LCS has only 50k and it came out 2 years ago.
Bully didn't do better either.
Maybe Rockstar scrapped mobile games from now and will release 10 Year Anniversary for next gen consoles and portables like Nintendo switch.