I mean for things like CDs and savings accounts, JPM Coin is irrelevant. I'm concerned more if JPM decides to use JPM Coin for higher-risk activities. What happens if they decide they would treat a supply of JPM Coin as a supply of USD, with the knowledge that if things go south, they could change the value of the pegged psuedo-currency and get a slap on the wrist?

Every bank could then conceivably be a central bank, except as a central bank that is profit-driven.