Not everyone is going to buy Chevy but almost everyone is going to research Chevy. The role of Chevy ads being shown to everyone plays a role in this. So a Chevy ad still is “relevant” even on an ice cream site.
Hum... The GP is almost certainly seeing those Chevy ads because he researched it. Not the other way around.
That's how tracking ads (don't) work. You usually get ads for things you just brought (or decided not to), hoping that you didn't actually buy it yet or will buy more than once, and the medium can intermediate the transaction.
ads can serve as a great discovery mechanism. instead, they're this annoying parrot that continuously yells at you about shit you've already seen and researched or some other unchanging highest bidder. fwiw, facebook, has recently surprised me with its ad relevance on a few occasions.
Not everyone is going to buy Chevy but almost everyone is going to research Chevy. The role of Chevy ads being shown to everyone plays a role in this. So a Chevy ad still is “relevant” even on an ice cream site.