A financial institution has fiduciary obligations to its clients to maintain the assets (here, the Bitcoin, ether, etc.) entrusted to them.
However, financial institutions are not currently obligated to maintain their clients' ability to transact those assets, let alone within a specific time-frame. Many people have sued their brokerages for not letting them sell stock in a timely fashion to take advantage of price changes; essentially all of them have lost or settled for pennies on the dollar.
However, financial institutions are not currently obligated to maintain their clients' ability to transact those assets, let alone within a specific time-frame. Many people have sued their brokerages for not letting them sell stock in a timely fashion to take advantage of price changes; essentially all of them have lost or settled for pennies on the dollar.