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If less-optimal temporal or spatial accuracy is enough, GEO IP stuff needs even less permissions
Good point, although GeoIP only works for home broadband really (and even then, only up to the nearest block or so); on mobile networks you only ever get to see the GGSN's IP no matter where you physically are (the idea that each tower has its own IP seems like a myth to me, never seen that actually happening for real), so you're missing out tons of info.

On the other hand device-based location (like the one that gets attached to photos) is often accurate enough to tell two flats apart so you can even tell very close users apart.