Sorting through which leagues are OPL eligible and aren’t will be done in a clear way that is presented to everyone but just isn’t a high priority before the keeper deadline.
Anyone joining a league that wants to play OPL should be pretty aware that 5MILB and arb coupons and other custom, unsupported rules will result in a league not being eligible for OPL. If anyone reading this wasn’t aware, well now you are.