Previously, you had to click on the Book button in Google Hotel Finder to get to the OTA and hotel website links. Not anymore, Google is now preferencing one OTA over the others and the hotel's own direct booking efforts by putting one OTA ad prominently on the hotel details page.
The Google Hotel Finder hotel details page previously just had a Book button and didn’t preference one OTA over another on those pages.
As Tnooz reports, this seams to have changed now, with Google Hotel Finder now preferencing one OTA over the others by putting one’s ad atop the hotel details page in a prominent bright red box.
EasyToBook, the preferred OTA in Tnooz's example, apparently is paying for this priority placement as Google Hotel Finder states on the hotel details page: “Booking links sponsored.”
In typical Google style, these advertising modes may be experimental and subject to change.
Get the full story at Tnooz