Mostly because PS4 didn't get hardware hacked. All of the hacks were software exploits that could be patched before folks were able to leverage them to bring their consoles online with cheats. iirc it did happen a couple of times though.

>PC players play on jailbroken (in a sense) machine.

PC games also ship with anti-cheat. Why ship anti-cheat to a console that's supposed to be secure?