Gave up on the idea to buy my location data from a data broker or a tracking service, because I don't have a big enough company to take a trial or $10-50k to buy a huge database with the data of millions of people + me. The only thing that stops anyone with access to bid data (yet another ad buying agent, or ad exchange, or a dataset bought or rented from data broker, as you'll see later) from tracking you down with all trips you make daily is this IDFA that is not shared when you disallow apps to "track you across apps" to "enhance and personalise your ads experience".