E-sports are serious business in South Korea. The Korea e-Sports Association is operated by the Ministry of Culture, Sports and Tourism and affiliated to the Korean Olympic Committee. E-sports have had serious problems with cheating, match fixing and illegal gambling. We're not talking about some niche hobby, but a significant part of the Korean economy.
I don't necessarily agree with this decision, but I think that it's unfair to characterise it as petty or draconian. The integrity of sport is a precious thing that needs protection. You might see an aimbot as the moral equivalent of a patch, but a professional e-sports player might see it as equivalent to a vial of steroids or a credit card skimmer.
There's a very fine line between cheating at a game and outright fraud.