Google via ASOP didn't set up wifi and Bluetooth randomization to help you remain anonymous as you walk down the street.

Instead they do so, so that they'd be the broker for that info. It's trivial to get that static info via apps, build a database, and setup scanners.

However Google has all randomized identifiers, and can link you to the same for the right price. I wonder how much they make on this front.

Knowing Google it's probably just stats, eg age, income, schooling, upcoming and past purchases, etc.