Underdog presses Tennessee suit after seven-state legal run

A cease-and-desist order arrived in Underdog's inbox from Tennessee state authorities, and the company's response was a federal lawsuit — its seventh against a state regulator since prediction market operators began fighting for the right to offer sports-event contracts without a gaming licence.

The complaint, filed in the U.S. District Court for the Middle District of Tennessee, asks the court to block enforcement on the grounds that the CFTC already regulates these contracts and federal authority preempts state gambling law. Tennessee had warned that non-compliance could trigger fines, criminal referrals, and revocation of Underdog's fantasy sports operator licence. Underdog's answer was to make the preemption argument in court rather than comply.

The strategy is consistent across all seven suits — Washington, Connecticut, Massachusetts, New Mexico, Ohio, Wisconsin, and now Tennessee — but consistency is not the same as strength. The Sixth Circuit, which covers Tennessee, has already ruled against prediction market operators in the Ohio matter. Kalshi filed for rehearing after that loss, which means the circuit has not closed the book entirely, but the controlling precedent in the jurisdiction Underdog just chose is adverse. Filing there anyway is either a calculated bet on a rehearing outcome that hasn't arrived, or an attempt to build a factual record in a friendlier district court before the appellate picture clarifies.

I have seen this move before — not in gaming, but in financial regulation, when an institution files in a district it knows will eventually be overruled because the intermediate record is worth having. It can work. It requires the underlying legal theory to survive long enough to matter, and right now that theory is running on CFTC preemption arguments that at least one federal appeals court has declined to accept.

The market context makes the urgency legible. Google's updated advertising policy now blocks Kalshi and other operators from running ads in five states where litigation is active. Tennessee is not yet on that list, but the trajectory is clear: each new state action narrows the addressable market and raises the cost of customer acquisition for every operator in the space. Underdog is not filing seven lawsuits because it enjoys litigation. It is filing because the alternative — pulling sports-event contracts from each state that objects — would leave it operating in a shrinking footprint while the regulatory map hardens against it.

The S&P survey data sitting underneath this dispute is worth holding in mind. Seventy percent of prediction market users traded sports-event contracts. Forty-four percent of survey respondents had never heard of a prediction market at all. The operators are fighting this hard over a product that dominates their existing user base but has barely touched the broader public — which means the commercial stakes of losing state by state are higher than the current user numbers suggest.

I think the consensus view — that Underdog is losing this war of attrition — is probably right about the near-term legal position but wrong about the endpoint. Seven simultaneous suits create seven chances for a district court ruling, a different appellate panel, or a CFTC rulemaking to shift the ground. That is not optimism. That is how regulatory outcomes have historically moved in financial markets: not through one decisive moment, but through the accumulation of rulings until the cost of resistance, on one side or the other, becomes untenable.