It's clear that it's a volume "let's hit users with tons of stuff they just searched for on Amazon", not a surgical strike "let's get users to buy what they need for their own life based on all the stuff they do through our platforms"
In the last three months I've noticed three string queries on Google give me back results with two strings and then one of the strings will have a strikethrough. Sometimes this spans multiple pages. This is terrible
After many years of things like 20% time, no one at Google has created anything that monetizes at a level close to ads. Why would they double down on what hasn't worked?
I'm pretty sure Google doesn't really have a plan to monetize any of those things (other than ads), but I think it's also pretty cool that a small minority of the company makes enough money to let the rest do pretty much whatever.
Whether it would generate revenue I dont know but testing it out should be easy.
Pick a small country - provide full unlimited search API access for a year to anyone and see what gets built.