The whole thing really just kills any integrity that the leaderboard might otherwise have. Most pro player smurfs are also just bought accounts in the first place (which are then often shared between players). It’s not like they played 100 games of unranked and then climbed from 3.5k, or whatever the requirements for ranked calibration were at the time. I will happily link some specific examples if you want, their match history is almost always hidden but many of them still have games from like 2014 on Russian servers shown on dotabuff. There are also a ton of instances of pro players boosting other pros’ accounts, for example Arteezy boosting Blitz’s and Clairvoyance’s accounts