Sixth Circuit upholds Michigan ban on sports contracts

Michigan court record closes as Sixth Circuit upholds sports contract ban

Dana Nessel did not wait for the federal preemption argument to resolve. On October 29, Michigan's Attorney General announced that Polymarket would stop offering sports event contracts to Michigan residents by the end of November 25, and framed it as the closing line of a sequence: Kalshi first, then Robinhood out by October 9, then Coinbase by October 10, now Polymarket.

The sequence is the story. Each exit came through a different legal mechanism — preliminary injunction, voluntary compliance, negotiated consent — but they all terminated at the same place. Michigan Attorney General Dana Nessel said the state was "holding the national sports betting industry accountable to Michigan law." What she did not say is that the Sixth Circuit made that possible by upholding the lower court's ruling before any platform could run out the clock on an appeal.

The consensus read is that Michigan is a state-level enforcement story: regulators found a willing court, platforms blinked, and now the precedent sits quietly inside the Sixth Circuit. That reading misses the structural weight of what the Sixth Circuit actually did. When a federal appeals court upholds a preliminary injunction against a CFTC-regulated platform on state gambling grounds, it does not merely resolve a dispute between Michigan and Polymarket. It hands every state in that circuit a template. Ohio, Tennessee, Kentucky — each can now point to a binding appellate ruling rather than a theory.

The CFTC's preemption argument, which is being litigated simultaneously in Utah and Louisiana and is at the center of active federal proceedings, has not yet produced a binding circuit-level answer in those jurisdictions. The Sixth Circuit did not directly address preemption on the merits in the way that would settle the question nationally, but it did something operationally significant: it allowed state law to win in practice while the federal question remained unresolved in theory. Platforms cannot afford to wait for doctrinal clarity when the interim cost is being shut out of major retail markets.

What I think the reporting underweights is the compounding dynamic in the platform economics. Robinhood, Coinbase, and Polymarket are all exiting Michigan sports contracts within a forty-six day window. These are not coordinated decisions — each came from a different legal pressure point — but the market signal they send collectively is identical. The cost of contesting state jurisdiction, state by state, through appellate litigation, is now visibly higher than the revenue from sports event contracts in any single state. That calculation, not the legal merits of preemption, is what drove each exit.

Kalshi is making the opposite bet. It is litigating in Utah, Louisiana, Missouri, and Illinois simultaneously, accepting the short-term market restrictions in exchange for the chance to establish federal supremacy at the circuit level before any state can consolidate its position. Whether the CFTC's active intervention in Utah changes that calculus is the live question — because a federal agency suing a state on a platform's behalf is a materially different posture than a platform suing a state on its own.