Age old dating site trick really. They are notorious, as many sites are, for using profiles that no longer active by the original users or stealing pictures from the sites for use elsewhere. I'm unaware if any of these sites have been sued for fraud use of such photos but True.com had a class action lawsuit against them containing that reason among many others. It seems most dating/casual sex websites use the same tatics like showing mass ads of beautiful models to attract you to the site only to find out all those are fake/spam users in one form or another.
There are real users on these site but from my own experience the actual number of real paying customers, even in major cities, is EXTREMELY small. Hence the reason there seems to be so many ads and spam.