> I don’t know the shady data economy at all, but are there datasets out there which let you de-anonymize just via residential/mobile IP address or hostname? S

> I don’t know the shady data economy at all, but are there datasets out there which let you de-anonymize just via residential/mobile IP address or hostname? Sure, and they're built using data collected from shady sites which ask for personal information such as CC details under dubious pretenses (like age verification) and associate it with the visitor's IP address. These de-anonymizing datasets exist because of poorly considered policies exactly like the one being discussed here.