I might be living in a country with very few banks (3). I may benefit from letting them know about a security issue, especially if because of that issue I could

I might be living in a country with very few banks (3). I may benefit from letting them know about a security issue, especially if because of that issue I could potentially go to jail I may not have the option of changing bank because the others are even worse. however I don't know how much I would pay for that. Probably some kind of class action would work.