Sports betting operator FanDuel is facing a class action lawsuit in California for allowing TikTok to identify and track customers who visited its platform.

The complaint claims the Flutter Entertainment-owned company installed TikTok-created software on its website which follows a “fingerprinting” approach to gather data about visitors who might otherwise want to stay anonymous. This information was then matched with data the social media platform already had about American users.

The lawsuit claims that any time a person goes to the sportsbook or clicks on one of the pages, FanDuel’s website automatically sends data to TikTok, even before someone can express their preferences on a cookie consent banner.

plaintiff alleges this breaches the Trap and Trace Law in California

According to the complaint that Next.io first reported, people are “never informed that the website is collaborating with the Chinese government to obtain their phone number and other identifying information.” The plaintiff alleges this breaches the Trap and Trace Law in California, which dictates that a platform can’t gather data to figure out the source of communications without the user’s consent or getting a court order.

The lawsuit wants to gather together a class of people in California who visited the FanDuel website during the period in question, to stop the tracking of data in this manner and get statutory damages.