Maybe it isn't needed
Originally HIBP and other websites used data breach dumps to solicit further data collection^1, e.g., with a fear-based, clickbaity title like "Have I been pwned?"
Maybe HIBP serves the author, maybe that's why it's "needed"
For example, it brings him notoriety
For example, he can promote his other cybersecurity website via HIBP and paid speaking engagements
The author has expressed dissatisfaction that companies are being penalised for data breaches through class action litigation, including any compensation users might receive as part of these settlements
He believes there is no user injury
https://www.troyhunt.com/data-breaches-class-actions-and-amb...
If that's his position, if he believes users are unharmed by data breaches, then what's the point of HIBP
Is it to support the companies who are collecting data and then being breached (not the users to whom the data belongs)
1. Data collection being the root cause of the data breach problem