it's intrusive anti-cheat-software operating on a system level where it could be a viable attack vector. thats what sucks.

what also sucks: this will make one of the most played games in existence unplayable on linux. and only so riot looks like taking a problem serious, that is probably much smaller than people think.

other than that: mobas absolutely require mechanical skills, that cheats could assist you with. there impact might not be as obvious as an incredible high hesdshot rate, but being able to consistently last hit creeps will give an ever increasing advantage over your opponent, canceling certain animations will increase the damge you are able to dish out over a given time frame and seeing the trajectory projectiles will follow makes them easier to dodge.

hell just supplying more information than the standard ui can be a huge advantage: knowing what your opponets buy, or invest there leve ups in all the time, displaying their cooldowns and stuff like that.