[idunno246]

its also more than just ip address. if you ever log into each others computers to check mail or any other system that requires a login, that company can sell your (device,username) pair to these cross device companies, and and you get another (device2,username) pair and its decided to be the same person.

https://whotracks.me/trackers/liveramp.html: twitch, okcupid, adobe

https://whotracks.me/trackers/drawbridge.html: etsy, aol, samsung

log into one of those from two devices and anyone who wants to pay will track you as the same person