How do you know the scale and how are you not sure that it's a vocal minority? After all, Monzo does target more tech-savvy users that might be more likely to voice their frustration online than with other high-street banks.
> One gets the feeling they're hiding behind the "we can't tell you why" excuse to escape accountability for a broken system that's literally ruining lives.
Because maybe they are being forced to hide behind that? UK banking regulations are notoriously strict when it comes to what banks are allowed to share with their customers.