I think the presumption of harassment is a little telling, but if your post was in good faith, merely advertising people's cars (as in the group pays for ad space etc) freely and legally very much like the musk plane tracking app would have the desired effect

The Musk plane thing is different because a) it's Musk, b) it's a plane

Nobody will care that Stan from Flock drove his sedan to pick up his kid from soccer practice, stopped at the store to pick up milk, and then drove home.

That's not how people are using Flock data, and it's not the same. The people abusing Flock access are the people abusing people. So the equivalent would be for people using the anti-Flock employee data would be harassing those employees. Not sure what that is "telling".