‘Lead‑offering’ business booming as usual! …but there are no conferences or exhibitions???

Being a regular presenter and visitor at conferences and exhibitions, it is not unusual for me to get unsolicited emails with offers to acquire the “verified” list of visitors or attendees, with function and contact details. Even for conferences and exhibitions I do not attend and often do not even know exist! Let’s not revisit … More ‘Lead‑offering’ business booming as usual! …but there are no conferences or exhibitions???