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I'm sceptical about this. The reason is that all banks in the US are subject to rather stringent know-your-customer regulation. They have to obtain documentation on their clients, which by law can be shared with the authorities. As far as I know, this makes it rather simple to trace the flow of money, at least domestically. If Apple were to become a bank, I don't see how they would get around those regulations.They wont.
But that's about Apple Pay transactions, which are logged into their central servers anyway, and will be given to the government when asked, as all banks do.
This is not about data on Apple Pay transactions, but about Apple Pay's security itself.
You wouldn't use an easily compromisable phone as your be-all-end-all wallet, the same way you wouldn't use an insecure banking portal.