I doubt if it's possible to completely get rid of cheater on any platform, cheaters will always come up with new methods. It can only be minimized, the act of plagiarism is being taken care of already.
I'm concerned with a user having several active account with different identity just to farm token, would have suggested that IP address can be tracked down but cheaters would know other way around. Hence, down voting and muting them is still the perfect way for now.