We don't know if the task is impossible because Google has no incentive to do it at all, so we can't assume they are really doing their best. They created this situation and they profit from it just the way it is.

The top two organic results for that precise query are pretty informative articles from Wirecutter and Good Housekeeping. Unless I'm misunderstanding and you are expecting something better than this: https://www.goodhousekeeping.com/home-products/a25473658/bes...

> 1) view their page for ads 2) click on their affiliate links 3) buy the product they're selling.

1 and 2 are trivial to detect. 3 is harder but still not impossible given Google's machine learning capabilities and existing datasets.

Downrank or ban ads & affiliate links and you remove any incentive for creating spam sites in the first place.