Airbnb Hosts Discriminate Against Black Renters, Study Finds
fastcompany.com
fastcompany.com
Well, not quite. Messaging on eBay is anonymized (but that can be defeated), but if a purchase is made, the Paypal transaction has the buyer's full name and email.
eBay is so zealous about forcing people to Paypal, you can't even mention the word "cash" in a listing or under Shipping And Payments.