A federal appeals court just threw out a new government regulation that would have required subscription services to give consumers an easy way to cancel. The Federal Trade Commission’s click-to-cancel rule was set to take effect next week, and would have required everything from your gym membership to Amazon Prime subscription to let customers cancel their recurring payments as easily as they signed up, and through the same method. Last fall, industry groups representing companies that benefit from subscription revenue — including cable providers, entertainment studios, advertising companies, and home security firms — sought to block the rule in court,...