San Diego County filed suit against AppLovin on Monday, alleging the mobile ad-tech company bypassed parental controls to serve children advertisements for adult dating services, alcohol, vaping and graphic sexual content. The complaint comes from the county's newly formed Consumer Fairness and Public Protection Unit, which filed three lawsuits that day.

The complaint claims AppLovin collected sensitive location and device data from minors even when parental controls and ad-tracking opt-outs were active. Screenshots filed as evidence include ads allegedly rendered on devices configured for six-year-olds running Google parental controls. The same unit filed a separate child-safety action against Roblox the same day.

What does the county allege AppLovin did?

The complaint lays out specific technical claims about how AppLovin's ad serving operated on child-targeted devices. AppLovin allegedly tracked children through fingerprinting techniques without parental consent. Data collected reportedly included information identifying where children live, study and sleep.

• One screenshot shows an ad for a sexualised AI chatbot served inside a physics-based puzzle game
• Another captures ads for cannabis gummies running on the same child-configured device
• The county alleges the company used fingerprinting to track children for ad targeting without parental consent

The allegations directly contradict AppLovin's published policies, which state the company does not knowingly collect personal information from children and does not serve advertisements to children. AppLovin had not filed a public response to the complaint as of Monday.

How does the SEC investigation fit in?

The lawsuit arrives eight months after the Securities and Exchange Commission closed an investigation into AppLovin's advertising practices. AppLovin CFO Matt Stumpf said in August the investigation had closed without enforcement action. The complaint references that prior SEC review, raising the prospect of continued state and federal scrutiny of the company's ad operations.

The SEC's closure does not preclude a renewed inquiry, particularly if discovery in the county case surfaces new evidence. State-level consumer-protection actions have, in past cycles, generated disclosures that re-opened federal files.

What is the AppLovin-Unity fight about?

The San Diego action lands four days after AppLovin countersued Unity Technologies over data collection in Unity's Ad Quality SDK. AppLovin alleges the SDK exposes competing ad networks' bidding data and asks the court to restrict Unity's collection and use of advertising telemetry.

The two matters put AppLovin in an unusual public posture: defending itself against a public-sector child-safety suit while pursuing a competitor over ad-data practices. Unity had not, as of Monday, responded publicly to the latest AppLovin filing.

What changes for studios and ad partners?

For developers on AppLovin's mediation stack, the immediate operational risk is reputational rather than technical. AppLovin's mediation layer routes ad demand across multiple networks and has become a default for many free-to-play mobile studios on iOS and Android.

Discovery that exposes fingerprinting methodology or data flows could pressure AppLovin to alter its SDK, with knock-on effects for fill rates and CPMs. Ad partners may also reconsider inventory tied to under-13 audiences, particularly in categories that already draw higher child-safety scrutiny.

The bigger signal sits at the enforcement level. The Consumer Fairness and Public Protection Unit is San Diego County's first dedicated consumer-protection body, and its three Monday filings — two named (AppLovin, Roblox), one unspecified — target major consumer-tech and gaming platforms. The county has telegraphed an aggressive opening docket.

Watch for AppLovin's response filing, the scheduling of the Unity suit's next hearing, and whether the SEC publicly acknowledges the renewed state-level scrutiny.