They should have to tell you that. I can see why it's convenient for them not to, but I believe the larger point is far more important.

That doesn’t seem like a good comparison: it’s a far more serious crime, and while the bank won’t tell that they’re reporting your activity to the authorities the legal process absolutely will and in sensible countries you’re required to be given the opportunity to challenge the evidence.

The problem being discussed here feels like it should be similar in that last regard: any time an automated system is making a serious decision they should be required to have an explanation and review process. If they don’t have sufficient evidence to back up the claim, they need to collect that evidence before making further accusations.