Hidden mmr was originally introduced as an attempt to counteract the smurfs in games. For instance, if a diamond 1 player dropped down to gold, they would play other diamond 1 players 'labled' as gold instead of actual gold players because...

not sure why, i says theyre claimed in my twitch inventory but i still dont have it in game. i know my accounts are linked because i got a beta key from twitch two years ago.