(copying my comment to answer you) From what I read in the Belgian post where I got this info, to be conform to GDPR, they will only track with opt-in. The tr

(copying my comment to answer you) From what I read in the Belgian post where I got this info, to be conform to GDPR, they will only track with opt-in. The trick is that opt-in will be in partners apps you will install on your phone. So, basically, your phone.