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What kind of personal data?
If you give me $5, I will tell you if I went grocery shopping this week or not.
Look at that, without us even providing you any money you've already admitted that you regularly grocery shop. That's going in your file.
*has... to... eat*
noted!
That data is likely already being scraped for free unless you always pay cash and never use any sort of customer reward card.
..and don't carry a phone with you.
The grocery stores in my area are also full of video cameras. If I wanted to go full-privacy, I would have to wear a mask to foil facial recognition, gloves, and generic clothes that I change out of after I leave so I can't be tied to videos showing my face elsewhere.
Then how do I get to the grocery store? Drive into the store parking lot with my license plates hanging out in the wind? Lol, no.
You drive one car to the store and another from the store, on both trips you switch cars midway through the journey, and you never drive the same vehicle twice.
And doing that, you'd be instantly recognisable due to the mask