When I worked in the travel tech industry several years ago, it was basically unfair to compete against Google Flights. We just accepted they didn't have to pay for marketing and had infinite compute to work with, and had to differentiate in other ways. They could operate the business at a loss and not really care because it was still good for Google as a whole to have user's travel data. They built a great product but didn't have to play by the rules everyone else had to follow.