Google Bans Prediction-Market Browser Extensions as Kalshi's Legal Pressure Mounts

Google has closed one more distribution door on prediction markets. On July 1 it updated the Chrome Web Store developer policies to prohibit browser extensions that facilitate real-money prediction-market transactions, folding the category into its list of banned regulated goods and services. Extensions that enable real-money trades on predictive outcomes are no longer allowed, developers have until August 1 to comply, and noncompliant extensions can be pulled after that. Google did not name Kalshi, Polymarket or anyone else, and the policy stops at the browser: prediction-market websites and official mobile apps stay reachable.

The practical footprint of the change is narrow. Extensions are a fringe channel next to the platforms' own apps and sites, and nothing here blocks a user from trading. What makes it worth reading is the timing and the direction. The policy lands in the middle of the heaviest regulatory pressure the sector has faced, and it is the second US platform this year to distance itself from prediction markets rather than lean in.

The legal squeeze the policy sits inside

Six days after Google's announcement, on July 7, US District Judge Analisa Torres denied Kalshi's request for a preliminary injunction against New York, ruling that the state's gambling laws reach Kalshi's sports-related event contracts and are not preempted by the Commodity Exchange Act. Torres found Kalshi had not shown a likely win on the merits, leaned on the strong presumption against federal preemption in an area of traditional state authority like gambling, and characterized the company's asserted harms as compensable money damages rather than irreparable injury. Kalshi filed an interlocutory appeal to the Second Circuit, and New York Attorney General Letitia James's office is expected to follow with a state-court enforcement action seeking restitution, disgorgement and penalties. Governor Kathy Hochul summed up the state's posture on social media: gambling with New York's laws would not pay off, "Just ask Kalshi."

New York is not the only front. The state has also sued Coinbase and Gemini, arguing their prediction-market offerings operate as unlicensed gambling businesses, and the sector has drawn scrutiny beyond gambling law. Spotify recently pushed back after finding its branding used in connection with prediction markets without any partnership, and separately said it had scrubbed more than 500,000 artificial streams that inflated a song's chart position, numbers a Kalshi market had been settled against. The through-line is that mainstream platforms are auditing their exposure to prediction markets, and Google's extension ban is one more instance of a distributor stepping back.

The Chrome update also tightened rules unrelated to the sector: extensions may now collect only data strictly necessary for their stated purpose, developers must disclose post-install changes to data practices, and a new provision bars extensions built to bypass safety guardrails in AI services. Bundling the prediction-market ban into a broader trust-and-safety refresh lets Google treat it as routine policy hygiene rather than a targeted move.

Records on one side, chokepoints on the other

None of this has slowed the money. Combined monthly notional volume across prediction markets reached $291.4 billion as of June 22, per Dune Analytics data cited by crypto.news. Kalshi alone did $21.1 billion in June against Polymarket's $9.7 billion, with $5.1 billion of that logged in the FIFA World Cup's first week, and its valuation has run from about $5 billion in early 2025 to $11 billion by December, $22 billion in May 2026, and a reported $40 billion target for a round that could close in the third quarter. The contradiction inside Google's own house is hard to miss: Google Finance began integrating Kalshi and Polymarket odds in November 2025, so the company is surfacing prediction-market data on one product while banning trading tools for it on another.

For affiliates and partners routing traffic to event-contract platforms, the extension ban itself changes little, since almost no acquisition runs through Chrome extensions. The signal underneath it is the risk worth pricing. A federal judge has now held that sports-linked contracts can be gambling under state law, a state attorney general is lining up enforcement, and platform gatekeepers are pruning their prediction-market surface area. Traffic sent into sports-event contracts in states like New York carries the same unlicensed-gambling exposure the courts are now testing, the same fault line running through the state-by-state court split over prediction markets and the Kentucky attorney general's suit against Kalshi, Polymarket and VGW. The policy does not resolve whether these contracts are federally regulated financial products or state-regulated gambling, the question still moving through the courts and shadowing Kalshi's march toward a $40 billion valuation. Google has not said whether more restrictions are coming.