Underdog Sports Sues to Prevent California AG's Fantasy Sports Opinion

Underdog Sports is suing to stop Attorney General Rob Bonta's office from declaring most paid fantasy sports games illegal under California law.

Ziv Chen - News Editor at Covers.com
Ziv Chen • News Editor
Jul 1, 2025 • 15:13 ET • 4 min read
Photo By - Imagn Images.

Underdog Sports is suing in California Superior Court to stop Attorney General (AG) Rob Bonta's office from issuing an opinion declaring most paid fantasy sports games illegal under state law. 

The company claims this opinion would cause it significant financial harm, jeopardizing around 10% of its overall revenue, derived from California customers.

Key takeaways

  • Underdog Sports sued to block AG Rob Bonta’s opinion threatening the legality of paid fantasy sports.
  • The California AG’s forthcoming opinion could deem all online fantasy platforms illegal statewide.
  • Underdog claims the AG doesn't have the legal right to declare fantasy sports illegal and is overstepping his reach.

Underdog's legal filing requests the court grant an immediate injunction preventing Bonta from releasing the opinion into the public domain until the court decides whether his office has the authority to make it available. Underdog alleges the AG's office wrote the opinion and laid out how it intends to use it to guide future enforcement or legislative action.

The company's case depends on three points. First, it argues attorney general opinions have to be legal interpretations rather than factual investigations. This is provided as proof of overreach in investigative authority based on the 18 months since then-Sen. Scott Wilk first requested the office open the investigation. Underdog contends the opinion strays from interpretation because there's uncertainty around the definition of daily fantasy sports.

Second, the lawmaker who requested the opinion, Sen. Wilks, is now out of office after serving his term limit, which Underdog claims makes the request for the opinion invalid. Lastly, Underdog stipulates the power to prosecute a vertical rests with the executive branch, not the AG. 

Sweeping opinion hanging over fantasy sports industry

Underdog's preemptive strike materializes as Bonta is said to be about to release a legal opinion that would make all paid fantasy sports websites, like Underdog Fantasy, illegal gambling operations under California law.

Since the opinion will probably enshrine a ban, the industry might be forced to close statewide. Meanwhile, tribal groups like the California Nations Indian Gaming Association embraced the AG's intervention, invoking consumer protection concerns. 

California joins sweepstakes casino crackdown

The crackdown follows a move against sweepstakes casinos. California lawmakers introduced legislation to outlaw sweepstakes casinos, following a similar law passing in New York and regulatory enforcement actions in Mississippi and Louisiana, where more than 50 cease-and-desist letters were issued recently.

Although California bill language hasn't emerged, it will make promoting and facilitating sweepstakes-style gambling illegal. Targets in its sights are financial institutions, payment processors, software providers, geolocation services, media affiliates, and celebrities who promoted the sites.

The law's impetus is the state constitutional framework, where gambling is restricted to tribal reservations. If enacted, it would reinforce that legal framework and close sweepstakes casino websites already accessible to Californians. 

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Ziv Chen
News Editor

Ziv has been deep in the iGaming trenches for over 20 years, long before most people could spell "geolocation compliance." With a background in marketing and business development at some of the biggest names in gambling tech, Ziv knows the industry from the inside out. Since joining Covers, he's turned his sharp eye (and sharper keyboard) toward everything happening in the fast-moving world of online gambling. Whether it's new state launches, the latest twists in regulation, or what the big operators and game providers are cooking up next, Ziv breaks it all down with clarity, context, and just the right amount of snark. He covers the business side of betting, from affiliate trends and revenue reports to the tech powering your favorite slots. His motto in writing is “let’s make it make sense without putting you to sleep.”

When he’s not tracking gambling legislation or looking for the next breaking story, Ziv is living and dying with every pitch and play from his beloved Pittsburgh Steelers, Pirates, and Penguins. As a Pitt graduate, it’s a city loyalty forged in heartbreak, but one he wouldn’t trade for anything, except maybe a few more playoff wins.

When away from the keyboard, Ziv loves to hit the road and soak up the energy of casinos. Whether strolling the neon jungle called the Vegas Strip, or wandering into a smoky riverboat casino in the Midwest, Ziv’s in his element. He’s the guy chatting with players, blackjack dealers, and asking pit bosses way too many questions, all in the name of “research,” of course. The casino floor isn’t just his workplace, it’s a weird and wonderful ecosystem of flashing lights, wild characters, and pure sensory overload, and he wouldn’t have it any other way.

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