It’s always amusing to see a business suffer from the turnabout-is-fair-play principle, so we owe props to the National Football League Players Assn., which has delivered a stinging hit on DraftKings in a lawsuit over the gambling firm’s attempt to slink out of its payments on a licensing deal.

DraftKings, the NFLPA asserts in the lawsuit filed a couple of weeks ago in New York federal court, collects billions of dollars in revenue “based on a simple premise: if a DraftKings customer places a losing bet, that customer must still pay up.”

In this case, the lawsuit says, “DraftKings has refused to play by its own rules.”

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