Valve is hoping to cut down on the number of high-level players that use multiple accounts for ranked matches of Dota 2 by requiring players to register their phone numbers ahead of queuing up.
The policy change aims to gently discourage players from using alternate accounts in ranked matches, a practice which often would muddle Dota 2’s skill-ranked matchmaking and create a negative experience for those unfairly matched against a high-level player on a lower-ranked alternate account.
The system requires players to tie a phone number to their primary account before queuing for ranked matches. That assignment can be changed down the road, but once a number is removed from an account it can’t be reused for at least 3 months. Valve also notes that online phone numbers, such as those provided by Google Voice, aren’t allowed.
Ultimately, no system is perfect but Valve expects to see a “noticeable reduction” in the number of players using multiple accounts in both ranked and unranked matchmaking after the change occurs on May 4.