Ban category for boosting

Boosting isn't allowed. It's fairly easy to identify empirically by observing player stats. For example, when a player has a significantly losing record in ranked and mediocre statistics across most champs but happens to be on a 10 game win streaked where they average something like 15-4-10 on Riven, it's pretty clear what's happening isn't legit. Why not add a ban category so players can flag these accounts for you and then they can be punished appropriately after some review? Given an abnormally high amount of reports you could increase the certainty of boosting by checking the IP addresses used for the account (if they're in disparate geographical locations, probably not legit) and doing some more formal statistical analysis to quantify just how much these performances deviate from the players norm or elos norm.