Unless the armies of bots out there started spending real cash for products after those ad clicks, I'm going to stick with "a lot of of people click on ads".
It's the top result for pretty much any search. And it often is relevant. Why go down to the actual results if you can just click the first link and get what you want? And most users don't use ad blockers.
https://www.statista.com/statistics/266249/advertising-reven...