In my case, I guess 90% of searches either include the term "stack overflow" or "Wikipedia", or get augmented by them when an initial search doesn't give desired results. I can't see how such searches might produce adverts that would help answer my questions.

It's very rare that I search for a product and even then, chances are that I add "review" or "sucks" (can work fine in combination with a specific product; negative reviews often tell you more about a product than positive ones, just like a requirements document or a product road map becomes a lot better if one includes things that people might the product to do that it will not do)

It would be the time when I'm hating apps the least, yes.

Usually, the companies whose ads I'd want to click on rank high in the organic search results, anyway.

Ads, not apps..