The UPI system adopted by India sounds promising to solve problems like these, where users can use the app of their choice and connect it to the bank account of their choice.
Eventually, you have a system where bank-to-bank transfers happen instantly with no intermediary apps holding your money.
Eventually, you have a system where bank-to-bank transfers happen instantly with no intermediary apps holding your money.
https://en.wikipedia.org/wiki/Unified_Payments_Interface