Collecting that data sounds creepy and nefarious, but if i think about what Experian and everyone else already knows about me, I don't know what information my phone's location would actually add that has enough value to build a massive telemetry engine.
But perhaps I am insufficiently paranoid.
On an individual level who gives a shit, but with large enough datasets you can essentially A/B test your way to psychologically manipulating people into more sales.