Underdog Fantasy has filed lawsuits in Sacramento County Superior Court to prevent California Attorney General Rob Bonta from releasing a legal opinion declaring daily fantasy sports (DFS) contests illegal under California law. The company sought a temporary restraining order (TRO) to block the opinion's release, arguing that attorney general opinions are limited to pure legal questions and cannot resolve disputed factual issues such as the role of chance versus skill in DFS contests. However, the court denied Underdog's request for a TRO, citing undue delay and noting that attorney general opinions are advisory and do not carry the weight of law. Despite the denial, Underdog continues to challenge the opinion and plans to keep offering DFS in California. On July 3, 2025, Attorney General Bonta released the official legal opinion stating that online fantasy sports platforms are illegal in California because they constitute wagering on sports, violating Penal Code 337a. This ruling applies to both draft-style and pick'em DFS games and is expected to have broad implications for operators like Underdog, DraftKings, and FanDuel. The opinion also emphasizes that games with players physically located in California are prohibited regardless of where the operators or technology are based. The ruling sets the stage for further legal battles and potential legislative efforts to clarify the status of fantasy sports in the state. California's stance aligns with a similar opinion issued by the Texas Attorney General a decade earlier, raising questions about possible reassessments in other states such as Florida. The California Department of Justice expects compliance with the ruling but has not specified enforcement actions. The opinion has created uncertainty within the fantasy sports industry, especially as some operators have recently entered sponsorship agreements with major sports teams in California.