They aren't necessarily convenient places. But it's not like you can't find any privacy privacy just because there cameras up high pointing down. It's actually probably far less intrusive and privacy destroying than the electronic device you likely carry everywhere with you that reports you location and could (if it doesn't already) keep track of when it can't report and relay it when it can again.

If you think the trade-offs of that make it worthwhile most the time, consider that there may be trade-offs here that are positive that you are discounting.