this could violate the copyright and cause the G.O.R.E. Corp to be sued and with so manny ai it could cause lag
Trust me, it 99.99% would not cause any copyright violations of any sort at all. If this were the case, games with a "survival against enemies" would pretty much not even exist because bigger game corporations that have already thought of this idea would not allow them to make a game with said idea. Obviously this is not the case, and a mobile game would most definitely be the least of their worries if any big game development corporation were even concerned at all with other game corporations taking their ideas.
Also, AI would not cause the game to lag, as they would not affect the game's running speed as much as actual online players, as they are being controlled by the game itself, and not the players. If any AI were to cause lag, it would be the fast-flying aircraft or helicopters with their propellers spinning very rapidly. And of course, they don't.