>so that's somewhat relieving.

well not really, all that means is that the surveillance company would need to augment the dataset with other features to get an accurate result. Also, I doubt they actually care about tracking you on a minute to minute basis. Knowing that you went to the pet store with 30% certainty, 4 times this year, is enough to pin you as a pet owner and send you pet-related ads. the same applies for an oppressive government. knowing that you went to a protest 5 times this month, with 30% certainly, is enough for you to get sent to a reeducation camp, or at least send some officers to surveil you and catch you in the act.

I think at least one of the larger points being made is that compared to the title, it comes off as clickbait.

And to track the other devices that your device was near most often.

Your credit card company knows all your purchases and your legal name, combined with what the ISP knows about your web browsing and google maps/cell provider with all your consistent location data, they have a very strong profile already not even including social media. This is small and irrelevant against way more advanced profiles they make with troves of your user data.