They do still offer it to the better options on their service. Often the ones without pro photos are new or not popular. I think they can make the assumption th

They do still offer it to the better options on their service. Often the ones without pro photos are new or not popular. I think they can make the assumption that if an owner won't put in much effort with their own photos, they won't make a very attentive host. It's trivial to take average photos, ask a friend for help, trade accommodation with a photographer or even pay for a professional.