Just checked: Ashley Madison is still in business and reached their highest (known) peak of users in 2019, about 4 years after the leak.
I'd sooner assume the membership count comprises bots and repeat throwaway/voyeur accounts.
this is already reported but once you leave the corporate sex worker exclusionary echo chamber it becomes more obvious how efficient that market is, from the supply side
it would alter most of your assumptions and make a lot of things more obvious without needing to be “studied”