A month before a Los Angeles jury was due to hear a Florida teenager’s case, Google quietly stepped out of it, leaving Meta, Snap and TikTok to argue the rest.

Google’s YouTube has settled with a teenage plaintiff weeks before he was due to face the company in court, removing itself from the second bellwether trial in California’s sprawling social-media addiction litigation.

Lawyers for the plaintiff confirmed the settlement on June 23, a little over a month before the Los Angeles trial was scheduled to begin on July 27. The terms were not disclosed.

The plaintiff, identified in court filings by the initials R.K.C., is a teenager from Florida who alleges that compulsive use of social media contributed to anxiety, depression and suicidal thoughts for which he continues to receive treatment.

His case was selected as a bellwether, one of a handful chosen to test how juries respond to the underlying claims before the thousands of similar suits behind them are resolved.

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The suit named four defendants. YouTube’s exit means the other three, Meta’s Instagram, Snap’s Snapchat and ByteDance’s TikTok, are still set to face the jury next month.

The core allegation across this litigation is consistent. Plaintiffs argue that the platforms were engineered to be habit-forming, with features such as infinite scroll, autoplay and algorithmic feeds that keep young users engaged at the expense of their mental health, and that the companies concealed the risks. The defendants have disputed that framing throughout.

The settlement follows a verdict that gave every defendant in this litigation reason to recalculate.

In March, a Los Angeles jury found Meta and Google liable in the first bellwether, awarding $6m to a young woman identified as K.G.M. and assigning Meta the larger share of responsibility.

It was the first social-media addiction case to reach a verdict, and it landed against precisely the two companies that had declined to settle beforehand. Snap and TikTok had settled that case before it went to trial.

Read against that history, YouTube’s decision looks less like a surprise than a pattern reasserting itself. Having already absorbed a loss in March, Google has now chosen the same off-ramp Snap and TikTok took the first time around.

The companies that settle disclose nothing; the ones that go to trial risk a number on a verdict form that becomes a reference point for every case that follows.

The scale behind these individual trials is what gives the bellwethers their weight. More than 3,300 lawsuits involving addiction claims are pending against the social-media companies in California state court, and another 2,400 or so cases brought by individuals, school districts, municipalities and states have been centralised in federal court.

The bellwether structure exists because trying them one by one would take decades; the early verdicts and settlements are meant to set the terms on which the rest get valued.

That machinery has been grinding in parallel through the school-district cases, which run on a separate track.

Snap, YouTube and TikTok settled one school bellwether before trial, and Meta later settled the Kentucky case that would have been the first school-district trial over youth mental health.

The personal-injury suits brought by individual teenagers, of which R.K.C.’s is one, are the higher-profile front because they put a single named claimant and a single alleged harm in front of a jury.

For Google, the cost of stepping out of the July trial is whatever it agreed to pay R.K.C., a figure it will not have to defend in open court. For the companies still on the docket, the calculation is harder.

Meta has been spending heavily on artificial intelligence even as the child-safety lawsuits mount, and it now heads into the second trial as the only one of the original four social-media defendants that has not, at some point, chosen to settle rather than argue the case to a verdict.

The July 27 trial in Los Angeles will proceed with the three remaining defendants. If any of them follows YouTube out the door before then is the question the next few weeks will answer.