Beginning with the fact that cryptocurrency was originally built in some sort as a mean to avoid banks and the bureacracy related to those kind of thing, is there any use for bank to launch their crypto, why would people who are searching for a non-centralized way to manage their asset to join centralization expert like JPM or other
The existence of banks has been given full authority by the government that shelves them especially in exploring government financial sectors (Monetary Sector, Real Sector and External Sector) and government revenue budgets, for example: Government Main Income, Government Expenditures, Government Financing, also including the Position of Government Securities.
As far as I know, not only JPM because before, Ripple had also done the same thing. As we know ripple not only (once) took over the position of ethereum, as a coin (ranked second) which was the most traded. IMO this proves that there is a high level of trust and public interest in Ripple as a smart investment supported by the bank.
Of course it's useful, because the system they manage is not different from when they manage their finances, such as the existence of income from transaction costs and other deductions issued by customers.