MK LoL is now illegal ???!!

Hello Forum, i just recieved a email that im using MK LoL and i get perma banned if i keep using it. But i thought custom skins are ok for riot because im only seeing them and in game is already jungle timer so when MK LoL became illegal and why. There is in my opinion no reason why you should get banned for using MK LoL only because its 3rd party programm.
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