I'm bearish on cryptocurrencies as lacking legitimate use cases, but metered services and honest subscriptions appears to be a pretty appealing one when card networks have policies like these. Volatility is a big issue, but using cryptocurrency for subscriptions could create more stable longer term demand characteristics where the subscription fee gets indexed to a cost at the time of purchase, with the small matter of who influences that index as it becomes a defacto peg. Card network policies just aren't something I think can be repaired.