Google updates Chrome Web Store policy: bans prediction market extensions

According to official announcements, Google Chrome’s Web Store has updated its Developer Program Policies to further strengthen user privacy protection, data transparency requirements, and platform security management. The new policies will take effect on August 1, 2026. Per the updates, Chrome Web Store will expand its prohibited products list, explicitly banning extensions that support or facilitate real-money trading on prediction market outcomes. This means Chrome extensions offering real-money trading features for prediction markets like Polymarket and Kalshi will no longer be available on the store. Additionally, Google is tightening rules on extension data collection: user data collected by developers must be strictly used only for the single purpose disclosed in the extension, and cannot be repurposed for any unstated goals. All data collection activities must be clearly disclosed to users, even if the data relates to the extension’s core functionality. If developers change their data handling practices after installation, they must proactively inform users. Google has also added a new "Malicious and Prohibited Products Policy" that explicitly bans extensions that bypass AI service security protections, usage limits, or other safeguard mechanisms. Google stated that this policy adjustment aims to enhance the credibility of the Chrome extension ecosystem and establish clearer regulatory boundaries in emerging areas such as prediction markets, AI security, and data privacy. Developers must complete compliance adjustments by August 1, 2026; otherwise, the Chrome Web Store may take measures including removing their extensions.