League of Legends rules describe Elo-boosting as follows:
“Elo-boosting is the repetitive and intentional act of an individual playing on someone else’s account (a “client”) for the purpose of artificially improving the client’s Elo rating. There is no minimum number of games required to be played, nor a minimum amount of Elo gain necessary to qualify as Elo-boosting. An attempt to boost Elo need not be successful in order to qualify as a rule violation.”
Elo is a system used to calculate a player’s relative skill level in games ranging from chess, football, basketball, baseball to eSports.
As per the League of Legends rules, the act of Elo-boosting is deemed illegal because it “damages the interests of players of all skill levels because it cheats the internal matchmaking system of League of Legends. Boosting leads to less-skilled players confronting a far superior opponent (the booster) during the boost and also leads to less-skilled clients being placed onto higher-skilled teams after the boost has been completed.”
The players found guilty of the offense have had their accounts suspended for 14 days and all of their Season Two rewards have been revoked. As per the League of Legends forums, the guilty parties have been “given a final warning with regard to Elo-boosting. Any further infractions will result in a permanent account ban and corresponding penalties, as deemed appropriate by LCS.”