California prices a knowing under-16 feed violation at $50,000 per minor from January 2027

Section 22684 is the operative sentence for anyone costing this out: a covered platform "shall verify the age of a user" before providing restricted features, and the bill creates liability per child every time a minor passes through an age check undetected ^[14].

There are two ways to satisfy that. The free one is the bracketed age signal that operating system vendors must pass to app developers under the Digital Age Assurance Act ^[16]. The other is a check the platform runs itself, on everybody, since you cannot sort out the under-16s without also sorting the over-16s. The Electronic Frontier Foundation asked Newsom to veto AB 1709 and called it "well-intentioned, but deeply flawed" ^[12]. On the group's reading, the statute forces the second option, because it names no minimum verification method and imposes strict liability for errors, so the most invasive verification available lands on every California user regardless of age ^[15].

The weakness of the free path is that the birth date is self-declared. A 15-year-old who types an adult date at device setup sends an 18-and-older signal to every app on the phone ^[17]. A platform leaning on that signal is buying its compliance at $25,000 per undetected minor if a court calls the conduct negligent and $50,000 if it calls the conduct knowing ^[5]. Two hundred misses is $5m or $10m ^[1]. AB 2 sits on top at up to $1m per child, twenty times AB 1709's knowing-violation figure ^[6][2].

What caps the exposure is procedural. AB 1709 has no private right of action, so a case has to come from the California Attorney General or a local public prosecutor ^[5]. A large platform can integrate the free signal, set a reserve, and wait to see whether anyone files; the deterrent then runs on prosecutorial appetite rather than plaintiff volume.

The other cost is product. Platforms that cannot technically separate addictive features from the rest of the service for under-16s have to rebuild the product for minors or shut them out of California entirely ^[8]. Either way, ranking loses that engineering time. The EFF's substantive objection is that the definition of addictive features is broad enough to prohibit virtually every functional recommendation algorithm for that age group. The group says that will hit LGBTQ+ youth and other marginalised users who depend on online communities hardest ^[13]. Assemblymember Josh Lowenthal, who wrote AB 1709, called it and its companion liability measure "the most impactful social media protections bills in the nation" ^[9][7]. Newsom, signing at a children's museum in Marin County, said: "Parents can't compete. Can't compete with the engineering, can't compete with the algorithms." ^[11][2]

This is the third technology-safety package Newsom has signed in two years, a sequence techtimes.com traces back to the 2022 Age-Appropriate Design Code ^[19]. The Digital Age Assurance Act gave device vendors about 14 months between signing and activation ^[3]. AB 1709's platform obligations land on the same date ^[16][3]. If covered platforms ship just the API integration and 2027 passes with no enforcement action, the reading that this law verifies every adult in California is wrong. The cost was a few weeks of integration work.