Simple fix:
Do NOT let anyone touch the ladder of any type for at least a month, to combat smurfing and preserve the integrity of the ladder.
Every day I face some player who’s on a bronze league account who clearly belongs in M+.
This results in a awfully one sided match ( 1v1 2v2 3v3 or 4v4 ) and its a terrible experience for every single player who plays any of the ladder types.
My suggestion? Do it like LOL, have some sort of level requirements for accounts before comp is accessible.
God speed.