Another example would be competitive overwatch where the developer's stated goal was an equal distribution of rated players throughout the various ranks (bronze

Another example would be competitive overwatch where the developer's stated goal was an equal distribution of rated players throughout the various ranks (bronze/silver/gold/platinum/diamond/masters/grandmasters). They tweaked the variables until they got their desired distribution, lumping the majority of players in gold and plat. Ranking up became an exercise in either playing hundreds of hours or starting a brand new account with fresh MMR. Predictably this led to an explosion in boosting and win-trading services.