Comment by jasode

Examples of competitors sharing data about bad customers across several industries:

- competitor banks share information about people who bounce checks

- competitor insurance companies share data about customers with fraudulent claims

- competitor casinos share photos of card counters

Probably many others I can't think of.

EDIT to reply: thanks for the customers' returns example. I found a story explaining the shared database: https://www.elliott.org/case-dismissed-2/the-retail-equation...