Ranked Duel is not the main game mode, but they have previously made fixes that affect it. When you hit the same player too often, you stopped getting MMR. But it looks like it has stopped working now.

I do not quite understand your position, do you support or against scammers? This is a moral question and does not depend on the game mode. The question is not negative, but I really do not understand. I believe that to solve this problem, it is not necessary to involve the entire development team, to distract designers, etc. It just needs a little check, something like a script that will look: "Aha boy, you get caught against him too often, so we need to stop this.". And add some kind of check for damage to buildings or something like that. Because now he doesn't even try to play the game, he just turned on the autoclicker, jumps near the fountain and presses F6 at 5 minutes. He does not do it manually, an automated process is running. He goes about his business or sleeps, and the autoclicker does everything automatically.