What can Nexon do to prevent hacks or make the game less vulnerable to exploitation?

Completely agree. But I don't think it has turned out cost-effective or whatever horsepomegranate excuses they blurt out. What do you think they should do or should've done?

To put it less delicately, we all know what the problem is, the solutions are not cheap, but are staring in the face obvious. There's nothing else to discuss on subjects like these because the only way they can fix it is a large investment. They don't make the "guaranteed" gross to feel comfortable doing that as of now.