That said, authors should follow responsible disclosure, give the game company some time to respond before releasing.
Hacks in singleplayer games are fun. Hacks in multiplayer games are not. If someone thinks the game is shit and unrewarding, they should just not play it and not ruin it for everyone else.
Stack-smashing attacks have been around since at least 1988[1]. This cheat has less to do with the game itself and more to do with the computing architecture (i.e. stack-based). ROP is an active area of research and "code hardening" is a way to mitigate such an attack[2], but (from what I understand) usually comes with performance penalties.
On another note it's not an exploit in the classic sense - if you own your game you're legally allowed to do what you want with it in most countries AFAIK. I'm not convinced responsible disclosure even applies here.
They dont really do shit
Rooting/jailbreaking/safetynet exploits (and exploits that can be used for rooting and jailbreaking) shouldn't go to google and apple first, they should go to the users first.
The same applies for bypassing anti-cheats or other modification prevention systems or other attestation systems.