It's difficult enough to see street names sometimes: you often have to zoom all the way in, which is very frustrating when you want to quickly work out what street you're on...
Step 1: Surveil the ever-loving shit out of everyone and everything you can
Step 2: Pimp out (via RTB) anyone wandering by to advertisers who want to take a crack at them
Step 3: Profit
This plays into Step 1. If someone even thinks about going somewhere, Google insists on knowing where. Bitch better have my money!