Collusion

A practice that is not great in and of itself can also become a race to the bottom among all the firms in that industry. What started as a single case study becomes suddenly industry-wide practice. If I take advantage of my customers by increasing the fees by 300 or 400%, there's a strong incentive for everybody else to undercut me. But if they receive the same advice, they are slowly nudge into a tacit collusion equilibrium.