OK, would you have a problem with Argos using CCTV to track you via ML that identifies different individuals and records their path through the store? What about CCTV that is displayed on a monitor and a minimum wage drone views, and records people's paths through the store manually? The outcome is the same in all three cases - Argos has data about how individuals are using their property, and can use that data for whatever purpose, probably making the stores more efficient and increasing profits. You can always wear several different masks and keep changing your clothes as you walk around a shop if you're worried bout being tracked, or maybe just don't shop there?
My point is that private companies are perfectly within their rights to track you on their own property, whether by computer or manually, and if you have a problem with it your only recourse is to avoid those companies. I have zero problem with a supermarket using my presence to improve the layout of their store, and to be honest, zero problem with Google tracking my phone's presence there to produce those useful 'when is this location busy' bar charts on their search results - it's helpful to me, and others, and free!
