Chips are easy to find. And our intelligence people are well aware of the dictators doing more tracking. The face recognition work in China, for example, is well-known, and easy to detect. And given the drawbacks of using chips, they'd have to be pretty stupid to use an method that was at once more costly and less reliable.
Because it's more costly and less reliable than other methods. Police occasionally will secretly put a GPS device on a car they want to track. Some car dealers have done it, so that if the payments aren't made, it's easy to find the car. These are generally illegal absent a warrant, but it's done. A reasonably intelligent crook anticipates that kind of thing. Do they destroy the GPS device? Generally not. They take it and put it on a someone else's vehicle, just for grins.
But you likely already have means for them to find you. If you have a cell phone, a Stinger device can mimic a cell tower and give your data to police from your cell phone. Again, of questionable Constitutionality, but arguably legal for the same reason you can monitor police broadcasts. In America, you can intercept any wireless communication, and so can the authorities. Hence, your cordless phone conversations aren't covered against search and seizure rules. Do you use toll roads? They get your license plate (and usually, it's illegal to put anything over the plate to confuse the camera). If you have a toll tag or other electronic billing device, they got you again. All of this is discoverable, since it's public and not privileged in any way.
The fantasies are a distraction while the real thing is being used by corporations and governments.
If you want to be informed, weird cults and websites aren't the way. Here's a group of rational, informed people who are looking out for you. You may not agree with everything they do (I don't) but they do know what's going on, and are working to protect the public.
Electronic Frontier Foundation