This likely caused the card companies, as well as affiliated banks, to re-evaluate their customers and get any adult site off, including the user at the top of this comment thread.
Was his site allowing user-generated content? No. Was he at risk of facilitating child porn? Also no. Would the banks and card companies be willing to research that and make exceptions for a single account? Unlikely.
[0] https://www.pcmag.com/news/visa-to-stop-processing-payments-...