Here is the part of the fair play guidelines I would use. you can't use it during the season, but if the owner tries to renew.
"For the balance and enjoyment of the world and its participants, however, it is not permitted to intentionally field an overly atrocious team when a much better team could have been assembled at the same cost and time commitment. For instance, it's no more difficult to field a healthy team in Hardball Dynasty that can win 50 games than it is to field a team that can win 30 games."
I just went through this in a world I commish.
The owner had a 15 overall rated reliever on his roster
Vin Rocker, 36ish overall 3rd basemen(who he has since jettisoned) starting, another reliever with a 31 overall rating, and he had a LF with a 27 Pitch calling starting at catcher while his catcher with a 80+ PC was sitting on the bench. He was also 17 million under the cap and had a better 3rd basemen sitting on the bench.......
I sent a ticket to WIS but I told them I did not wish the owner removed yet, I just wanted a written record of his history submitted in a ticket. However if the owner would of persisted I would of argued that he could of greatly increased his chances of winning at the same cost and commitment.
My suggestion is since it is a public world to start a ticket and update the ticket every time this owner does something towards tanking. Document as much as you can.