The greater number of prostitutes (as far as total quantity of people providing sex for material gain) only work to fill a specific need, not all the time. They usually quit fairly young.
The general public immediately thinks of full time prostitutes in brothels, on the street, or working for escort agencies because those are the ones who get arrested or whom authors and journalists can find.
If you look at the total numbers then yeah the article is likely accurate - but who cares about CNN anyway?
I still don’t buy the numbers. Folks involved in almost any cause come up with overstated figures.