> no one is allowed to be clean in this game.

That is why corruption is endemic to authoritarian regime. In a state where it is impossible to climb the ladder without accepting bribes and giving them, you make sure everybody and guilty and its easy to do some "clean-up" whenever you need it.

Anti-corruption operations in authoritarian regime is just this, replacing problematic cronies with more faithful ones.

Systemic corruption is a proven mean of control.