A new gig means a new email. Send your tech policy tips, feedback, hopes and dreams to david.mccabe@nytimes.com.

Breaking: Google broke antitrust law to maintain its dominance over online search, a judge rules, in a major victory for the Department of Justice. “Google is a monopolist, and it has acted as one to maintain its monopoly."

New: In a mostly-redacted portion of a court filing, a U.S. official says that TikTok and ByteDance have “taken action in response” to Chinese “demands to censor content outside of China." w/ @sapna

Scoop: Antitrust regulators have reached a deal that clears the way for federal investigations into the conduct of Nvidia, Microsoft and OpenAI in the AI industry. It is expected to be finalized in the coming days.

Our March profile of Jonathan Kanter, the Justice Department official (and hobbyist musician) whose team sued Live Nation and Ticketmaster today.

New: DOJ plans to argue that Live Nation would use one part of its business to reinforce its power in another part. Live Nation artists ended up at venues that used Ticketmaster &c. Those tactics raised ticket prices and fees for consumers, it will argue.

Such great news!.

More than a decade ago tech used this playbook to beat back a pair of copyright laws. Today's effort by TikTok ended in a very different outcome.

Thanks to the @FACoalition for recognizing our work to improve public access to the U.S. v. Google antitrust trial. It has been a true team effort.

There are a lot of great reporters on this list. I've shared a beat with @ryanjtracy and @johndmckinnon for years — both stand-up colleagues who break news and write sharp stories.

New: The FTC has launched an inquiry into Microsoft's investment in OpenAI and Google and Amazon's investments in Anthropic. The findings of the study could influence later formal investigations into whether the companies have broken any laws.

News w/ @trippmickle: The Justice Department could file an antitrust lawsuit against Apple in the first half of this year, as its inquiry into the company reaches the late stages and senior officials review its findings.

How Nations Are Losing a Global Race to Tackle A.I.’s Harms. via @satariano @ceciliakang.

Inside the A.I. Arms Race That Changed Silicon Valley Forever

Ego, Fear and Money: How the A.I. Fuse Was Lit. Spend your Sunday with this deep reporting on the distrust and feuds fueling the escalating race for artificial intelligence. via powerhouses @CadeMetz @KYWeise @nicoagrant @MikeIsaac.

And @nicoagrant reported yesterday that around $18 billion of that sum went to Apple.

Very glad to see this. I want to echo the thanks to @nytimes senior counsel @alamynsumar, who has argued tirelessly for press access to this trial.

@ceciliakang @trippmickle And an ace explainer by @KYWeise to round out the day:

"Certainly there wasn’t a valid alternative." Apple's top deal maker testifies about agreements at the heart of the DOJ case against Google. From @ceciliakang at courthouse & @trippmickle:

@nicoagrant @ceciliakang @trippmickle Here's @KYWeise on Andy Jassy's cleanup job:

Down the street, U.S. et al v. Google has entered its third week. @nicoagrant, @ceciliakang & @trippmickle have a great look at what has become defining feature of the trial: its secrecy.