Note the Ashley Madison wiki page says that these BS accounts are actually presented in the terms and conditions. I'm kind of impressed with the hutzpah of even giving these fake accounts the name "Ashley's Angels":
Several aspects of Ashley Madison are described in the Terms and Conditions as "For Your Entertainment."[19] This included Ashley's Angels, a feature that generated fictitious profiles to simulate communication with real members and perform market research. According to the site, Ashley's Angels accounts "are NOT conspicuously identified as such."[20] Ashley's Angels profiles were limited to messaging only guest accounts and users could opt out of the feature via their profile management page. Users were charged the standard rate to read messages from and chat with these fictitious profiles.