But it's not in the interest of Stripe et. al. to subsidize fraud. The fact that they have the penalty set so high is because they don't want services like JSBi

But it's not in the interest of Stripe et. al. to subsidize fraud. The fact that they have the penalty set so high is because they don't want services like JSBin acting as basically defrauded card authentication gateways (as a side effect of their legitimate business). Unfortunately for Remy Sharp, he built a fraud enabling system that doubled as a pastebin, and the financial system responded as appropriate for an open fraud portal. It's a bit like calling foul when email gateways start mistrusting your server because it's a proven open-relay node for spam. Not fair, but the system has to protect itself and its users.