Thanks for the feedback. In this case, the target clients are regular users, not companies. Craigslist doesn't need to share any of their data for this to be useful to Craigslist users.

"Whether someone commits sexual harassment on OkCupid doesn't matter when you are trying to buy their toaster on eBay."

You can choose to ignore this information, but for some users it may be a relevant signal. I personally would rather buy a toaster off of non-sexual-harassers. Also, perhaps there will be less harassment if there were consequences, i.e. a worse online reputation.