Typically once the reviews are out of girls providing high end mileage there is a good chance that the other girls in that place will talk her into ceasing those services through ridiculing, shaming etc.
I remember Destiny's spa back in the day. If a girl was offering more than the other girls, they would jump all over her. It's shitty for the guys but I guess works for the girls on mass.
This also applies to pricing for services as well.