The trouble is few women get involved in prostitution without a pimp. While overseas I saw women being sold to bar owners. I ran across american girls who had been forced into prostitution and were too scared to even ask for help.
These girls can’t protect themselves and don’t exist without a pimp and a customer. BTW the worst pimps are usually women.
While customers are a requirement, pimps are not.
What is true is that freelancers who work a route of regular outcall clients rather than having a pimp or doing street and escort work rarely come to the attention of the gendarmerie or the press...unless they are murdered. This does not mean that there are not a lot of them.