Many large studios, I specifically think of Blizzard and Jagex, have a reputation for wielding legal successfully against third party clients, phishing, trademark/branding abuse, botting, and similar activities. Further there are severe legal consequences in China and elsewhere for cheating in video games.
Even if there isn't decisive legal consequences they can carpet ban whoever they want whenever they want. Which is likely the reputation which causes the landing page of this service to be plastered with "don't worry you won't get banned" all over the place.