Thank you for the details, but I must still be missing something. FB shadow profiles aren't valuable to anyone unless they also know who you are, which is my point. Say the restaurant sells your transaction data to FB and they add it to your shadow profile... now what? If you're using an ad blocker, FB won't be able to link any other online activity to your profile and ad targeting won't work because you're blocking them.
The next step someone would probably say is that other sites you transact on might also be selling your info to FB, but again how is that valuable if they can't know who you are until you either login or enter your payment details? Generally speaking, your profile info is only valuable for advertising (people want to get you to their property to buy things - once you're already there your profile value is a lot lower). If you effectively shut down the advertising funnel entirely what's the issue here. Yes, it's bad from a general privacy standpoint, but what else?
>"Thank you for the details, but I must still be missing something. FB shadow profiles aren't valuable to anyone unless they also know who you are, which is my point."
Shadow profiles are valuable to FB as it provides data on the interests of a FB user's real life friends. I don't doubt there's categories along the lines of "has 2 or more friends who regularly frequent wine bars in West London" or something similar.
The next step someone would probably say is that other sites you transact on might also be selling your info to FB, but again how is that valuable if they can't know who you are until you either login or enter your payment details? Generally speaking, your profile info is only valuable for advertising (people want to get you to their property to buy things - once you're already there your profile value is a lot lower). If you effectively shut down the advertising funnel entirely what's the issue here. Yes, it's bad from a general privacy standpoint, but what else?