Google Puts a New Prediction Markets Ban on Chrome

Google has banned prediction market extensions from the Chrome Web Store under updated Developer Program Policies. Extensions that facilitate or enable real-money trades on predictive outcomes face enforcement starting August 1, 2026.

The change adds a new distribution chokepoint for Polymarket and Kalshi just as sector volumes hit records.

Why Google is Blocking Prediction Market Extensions

Google announced the changes on July 1 through the Chrome for Developers blog. The company expanded its Regulated Goods and Services policy to name predictive markets as prohibited products. Non-compliant extensions risk removal after the deadline.

The update reaches beyond event trading. Extensions may now collect only data strictly necessary to a disclosed single purpose. Developers must also prominently disclose every data practice and flag later changes.

A separate rule bans tools built to circumvent safety guardrails in AI-powered services. Google framed the overhaul as a trust measure in its official announcement.

“Users should always have full visibility into how their data is handled, with the confidence that their extension ecosystem operates responsibly.”

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The stance cuts against Google’s own products. Google Finance began integrating prediction market data from Kalshi and Polymarket in November 2025. The company now welcomes the sector’s odds while blocking its trading tools.

Mainstream Momentum Meets Mounting Restrictions

The ban lands on a sector trading at record scale. Combined monthly notional volume reached $291.38 billion as of June 22, according to Dune data.

However, restrictions keep stacking up. Argentina ordered a nationwide block of Polymarket in March, joining more than 30 countries. That same ruling forced Google and Apple to pull Polymarket’s apps for Argentine users.

In the US, the Commodity Futures Trading Commission (CFTC) is defending the sector in court. It’s a lawsuit over a Kentucky prediction market crackdown followed by similar cases against states, including New York and Wisconsin.

Capital keeps flowing regardless. Kalshi reportedly seeks a $40 billion valuation, months after a $1 billion Series F. Meanwhile, a Wall Street Journal analysis found Polymarket users losing money in over 70% of accounts. Just 0.1% of accounts captured 67% of all profits.

Prediction markets remain reachable through websites and mobile apps, so access itself survives.

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