Came across news articles about Backpages losing their credit card processing from MasterCard and Visa.
Seems their ads went free for a few days and are now offering payment thru bitcoins.
2015-07-01: Visa follows MasterCard, cuts off business with Backpage.com
2015-07-06: Caving to Government Pressure, Visa and MasterCard Shut Down Payments to Backpage.com
2015-07-07: Backpage.com Says Screw Off to Squeamish Credit Card Companies by Dropping Fees For Adult Ads
2015-07-07: After slaying, Backpage.com urged to drop ‘adult’ section
2015-07-09: Backpage.com Adult Section Goes 100% Crypto