One major bank set up an online payment service in the UK about ten years ago which allowed you to load money, fee-free, from a credit card, and then pay other people. Of course, said money, once loaded, could also be withdrawn back to your bank account, but why would anyone do that?

WHILE airmiles < MAXINT do { load, withdraw, pay card bill }

Round and round the money goes. :)

Obviously the fee-free aspect was unusual, perhaps an oversight but more likely an attempt to get some critical mass in the online payments market which, at the time, was primarily only PayPal and a UK outfit called "NoChex" (which of course DID charge a fee.)

Eventually a loading fee did arrive, and a little later on, the service closed up shop entirely.