"It costs less" ... and the question is who pays that cost. If customers leave it's bad for the bank, if customers get scammed then the customers lose their mon

"It costs less" ... and the question is who pays that cost. If customers leave it's bad for the bank, if customers get scammed then the customers lose their money "well you should have protected your identity better, there's nothing we can do". So from the bank's perspective, customers getting scammed doesn't cost them anything.