[peteretep]

As with most pieces of surveillance, it's that there's a cost difference.

To find out where I am, you'd currently need to have me tailed. The cost involved gives me a reasonable degree of privacy in my estimation. You'd need to have some kind of reasonable cause, and assets, and need to think there was something in monitoring my movements worth spending for.

If it costs you $5 to pull up a complete driving history, you can surveil 1,000 people for the same cost, and go for a fishing trip. See if anyone moderately wealthy has been in a bad part of town, etc