If bookingdotcom and others have gained so much market share so fast on the Caminos, it is because the thousands of albergues, pensions, hostals etc have not grasped the needs of the peregrinos. This goes along with the stubborn and longtime refusal to accept more convenient forms of payment than cash. Hardly any other "business" would have lent itself better to organizing a mutual Peregrino reservation system than the Camino with its particular "customer"-base. Imho even now it would be possible to fend off the big booking sites using an innovative, low-cost system using mobile communication for reservation and payment focussed on peregrinos. There is enough business and all it would need is that the actors along the Caminos organize themselves.