In the UK at least, they've tried. https://www.gov.uk/cma-cases/online-hotel-booking https://www.gov.uk/cma-cases/online-hotel-booking Booking.com, amongst ot

In the UK at least, they've tried. https://www.gov.uk/cma-cases/online-hotel-booking https://www.gov.uk/cma-cases/online-hotel-booking Booking.com, amongst others, gave enforceable undertakings that they'd change their practices.