There is plenty of personal info about you about there already, I'm not sure a little more would make it any worse.
Tesco already know a lot about my spare time thanks to their loyalty card - the fact that I go shopping at odd daytime times means I don't work, they can see that I am buying for two and like a drink, even hazard a guess at which drink is preferred. The in-store cameras would be able to tell then what I am interested in, whether I shop alone or with partner/family. They would know if I was entertaining as I'd buy stuff I normally don't, and if it were a BBQ as I'd buy charcoal.
Individually they may not tell much of a story but if you aggregated my banks data on my spending patterns you would also know quite a bit about my lifestyle and preferred holiday destinations, and whether I look for cheap fuel and whether I withdraw lots of cash because I am paranoid about people knowing where I spend my money (or maybe because I have something to hide).
My phone knows where I am, where I've been, how long for, whether I walked there and what apps I looked at during the day and for how long. My TV company probably knows what TV I prefer to watch, certainly to record. My ISP has a good idea when I am at my computer (and, for many, what sites you visited), my energy company knows when I charge my car and when I have meals - even when I put the kettle on.
And of course social media (including here) is often quite an eye opener about other people =- their movements, habits, likes and dislikes.
There is already massive amounts of data to be had. Whether anybody stitches it together is another matter, but I think that's the kind of things the Facebook scandal was over (Cambridge Analytica??) and I bet they aren't the only ones.
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