The critical difference is that in China, the apps effectively are the banks, whereas in the US, regulatory capture ensures that the banks stay the banks and it's the app's problem to figure out how to interface with them. The reason the banks are scared is not because "banks" are not involved. They're scared because these apps have successfully vertically integrated to become banks. This is the logical next step for…
nordstrom, for example, is/owns a bank (until recently, it seems it’s been sold to charles schwab) but that’s because they got their charter in the 90’s before the regulatory burden became prohibitive (and was grandfathered in).
so i’m not sure tech companies can easily verticalize into banking.