Google is integrating third-party reviews into the Knowledge Graph for hotels. It apparently has been happening since 2016 and is entirely opt-in for the provider.
Google works directly with the third-party review source (e.g., TripAdvisor) to integrate the content. In the example below, TripAdvisor reviews for Southern California hotel Terranea are available under the “view Google reviews” link in the Knowledge Panel.
Google got into trouble roughly seven years ago for “scraping” and incorporating third-party review content from sites like TripAdvisor and Yelp into Google Places without permission. Yelp saw the move as a kind of antitrust “extortion” and mounted a vigorous campaign against it.
One of the provisions of Google’s 2012 antitrust settlement with the FTC was that the company would allow publishers to block Google from including third-party reviews in “vertical search offerings” without their being excluded from the general index. According to the FTC statement announcing the settlement:
Google also has promised to provide all websites the option to