According to Tim Rogers in-app purchases are already being regulated in Japan. As far as I understand it there must be a finite number of purchases, leading to a "maximum spend" per title, which can be shown in-store.
Not sure how this ties in with that, but it seems several companies are also self-regulating by imposing a spending-limit based on the customers age.
That's not to imply it wasn't helpful. Just that once we knocked out all of the low-hanging fruit the map turned into an indication of where people played. Remaining crashes weren't related to location or content.
The first pass actually had a nice grid pattern on the map that was where ambient audio emitters happened to overlap. Something about the transition between two ambients emitters was falling over.