You have never seen (even though I actually have seen in Wild in the times of mass bot farms before the Wild pass) because right now you can't choose your league. What's gonna stop you from choosing D/C with a level 1 account when that's allowed. Have 100 people do that with 2 accounts each and now you have 200 level 1 accounts in Champ. They will create a subleague of their own cause they'll stay at the bottom in terms of rating and get mostly matched against one another.