Looking at the graph of reverse location searches over time (despite being an atrocious way to present the information) shows that there were a lot when it was

Looking at the graph of reverse location searches over time (despite being an atrocious way to present the information) shows that there were a lot when it was first started and then quickly petered off. Is this an indication of its efficiency, pushback from Google, or denials from judges, I wonder? Edit: Or they were just hot on it after the training and then their interest petered out.