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You don't even need satellite to track people, the FBI has been getting really good results with a small fleet of Cessnas.

https://www.theguardian.com/us-news/2015/jun/02/fbi-surveill...

Not to mention you already carry a mobile phone with both Bluetooth and wifi turned on. You gym plus others knew you have not been there since February.

The temporal resolution isn't great, and you don't have much control over timing. Also 50cm is too coarse for much people-sized activity to be really identifying.

So; great for seeing how a property has been developed over time, not so great for seeing who is going the gym or not.

50cm is not really good to identify a person. And it's not real time at all. You'd be better off calling the gyms directly.

These scans don't update with much frequency.

That's like using Google Street View and noticing an unknown car in your driveway and assuming your partner is having an affair. Much more likely, the image is old, and that car belongs to the previous tenant.

Google already knows this if you have an Android phone.