Valve has banned 90,000 Dota 2 smurf accounts, and will wipe out their associated main accounts, too, if they continue to spawn smurfs to bypass Valve's matchmaking system.
In a candid post, Valve said that any main account found to be associated with a smurf – that is, an alternative account created by an experienced player just to farm XP and/or destroy lower-levelled players – could face "a wide range of publishments", including permanent bans.
"Today, we permanently banned 90,000 smurf accounts that have been active over the last few months," the team explained (thanks, PC Gamer). "Smurf accounts are alternate accounts used by players to avoid playing at the correct MMR, to abandon games, to cheat, to grief, or to otherwise be toxic without consequence.