Given that my biggest annoyance with search is the pollution of my results by sales sites, I think returning Amazon results - UNASKED FOR - in *any* search of mine would be infuriating in the extreme.
Okay, I don't like deb systems anyway, but I wouldn't bother turning off that misfeature - I would just trash / and replace the entire distro with something else.
The ONLY time I want sales results is usually when I go directly to a shop site and use their local search engine. Going via Google all too often finds me in maze of nasty little aggregation sites, all alike. Google search is polluted enough already without all these shop / sales-aggregation sites moaning that they don't get enough prominence in the results!