As Moen puts it, it could be that prostitutes are far less fungible than other service providers.
The sexual act often has a strong element of reciprocity to it: the pleasure I derive from it is at least partially constituted the pleasure that my partner derives from it.
The term john may have originated from the frequent customer practice of giving one's name as "John", a common name in countries, in an effort to maintain anonymity.
Medieval civilians accepted without question the fact of prostitution, it was a necessary part of medieval life.
This practice is justified by the face that these drivers live, on average, more than 21 days away from home and see these activities as the principal distraction during their off time.
Set it and collect blessings from Allah swt for the khayr you're supporting without thinking about it.