These lists can be manipulated. There was a case a few years back involving bogus bookstore sales of Lani Sarem’s "Handbook for Mortals" to trick the New York Times: Stamper and other YA writers, including Jeremy West, began to investigate. Stamper shared messages he had received from bookshop staff who said they had been contacted to see if their store was an NYT-reporting shop – the paper’s lists are collated from…
This has been going on for a very long time.
EDIT: Phrasing.