TL;DR they swindled your contact info from users, purchased it and/or traded for it. >This info was collected by the advertiser or their partner. Why do you t

TL;DR they swindled your contact info from users, purchased it and/or traded for it. >This info was collected by the advertiser or their partner. Why do you think so many apps want to extract your phone contact list if not to sell? Have you ever given that phone number out, even if only to one friend or relative? If your name and phone # are saved in their smartphone contact list, they may have been using a smartphone with an adware OS designed by the largest data monitizer on earth bundled with additional spyware preinstalled from the manufacturer, service provider, plus 10 of the highest bidders. Those advertisers could have bought it from your cc issuer, merchant, loyalty card issuer, car dealership or bank as part of a bundle with your transaction history. It could have come with a location history package from your mobile service provider or it could have come compliments of Equifax. Sure, it could have been collected way back in 2017 or whenever while FB was still giving the data out for free. There are plenty of totally innocent explainations... If it turns out next month that those 1,147 advertisers are all just Alphabet companies and the contact list was uploaded by their partner, Facebook, you'll sure feel stupid for jumping to conclusions. /s