It is interesting that the mentioned petition condemns duopolistic practices from TripAdvisor and Expedia and not rather oligopolistic practices from those two plus Airbnb and Booking.com. The dependence on these listing sites has become one of the toughest challenges in this industry, not only for property owners but also for vacation rental management companies, who have seen their margins plummet. There are many ways to overcome what some call the "listing site dependence" and building an independent website is the first step to getting more direct traffic and direct bookings, even if most of the leads now typically come from one of the big 4.