The goal isn’t to stop every cheater, the goal is to reduce the number of cheaters. They achieve this by making the monetary cost of cheating so high that it do

The goal isn’t to stop every cheater, the goal is to reduce the number of cheaters. They achieve this by making the monetary cost of cheating so high that it doesn’t happen often enough to affect the vast majority of players. “Private cheats” are expensive, “public cheats” get killed off quickly, pushing up the cost of “private cheats”.