the Official Twitter of DOTA 2 wrote that Valve banned 40000 players for “abusing matchmaking”, but still not clear what this means. The company has not made any comment about this term.

Perhaps this is due to smurfing and boosting accounts.

Smurfing is when experienced players create new accounts to easy to win beginners and boosting pumping account beginners, often by third-parties. Perhaps it is connected with this new wave of bans from Valve.

about the team wrote that improved detection system smurfing, which will be even better to find such players.