Story as old as time. Fintechs may be cheaper or have a cooler app, but if you ever stray off the happy path, you can kiss your account and/or money goodbye.
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Been party to more than a couple situations with large banks who decided that you violated some hidden AML related policy and with zero recourse. You are lucky to even get your money out of those accounts without lengthy litigation.
Might happen more with fintech, but traditional banking does not remotely make you immune to this. Start doing anything interesting not “normal” and you’ll find out the hard way.
I get the impression these institutions run ML software that was written by people who knew it would generate false positives but is now run by people who have been told that it is always correct. I say this having seen a bank manager call the group responsible on an internal phone line and them tell the manager that they suspect they (the branch manager) is a fraudster.
So, from an ML perspective you want to maximize recall, precision be damned.