> For a weather app that would mean not sending my location data anywhere, but also not sending the locations I want the weather for anywhere either since if you know that most of the time you'll be able to tell where I am or where I will be.

This doesn't even make sense. How do you want a weather app to not send "locations you want the weather for"?

Also, updating a local copy of every weather place on the planet doesn't scale at all. There's so many places that it won't fit on a single device.