Your random searches are not that valuable from a monetization standpoint. Searches that lead people to buy things are. Those searches are easy to pick off on a category by category basis. I had no idea that Google actually took up most of the screen on mobile with ads for products for sell until this thread. I’ve had Ad blocking on for just that long.
In fact it's the opposite happening with Google now pushing into searches for flights and hotels with far better UX, even though those verticals were dominated by other vendors.
Nobody cares about some app that gets 0.001% of the usage and probably doesn't even have any strong identity link. "Shopping data" isn't magical nor is it of interest to every advertiser. Purchase data is also already processed by specific companies with their own properties or in aggregate by many ad networks. And, in case you missed my first comment, Google recently closed a deal to get purchase data directly from Mastercard which is far more than any single retailer could provide.
If you actually have an example of a specific app that is delivering much greater ad performance then perhaps you should share it.