Keep in mind that Google is anti-knife.
They will not allow any website that sells special knifes such as automatic or balisong knives (or any guns) to purchase sponsored results under any search subject.
So, let's say that your website sells such knifes to legal customers and also sells flashlights. Your compeditor who only sells flashlights can purchase a sponsored result so that when a would-be customer searches for sites selling flashlights, his site comes up first on the list. Because you also sell those evil knives, you can not purchase that same sponsored result. So, because you sell these knives, google puts you at a competitive disadvantage in flashlights.
I've argued this with Google and they are unrepentent. It is their company (California company) policy to use their search engine to advance their social agenda which includes anti-gun and anti-knife elements.
Google is not a charity. They are a for-profit business. But how can they make a profit? They give their service away? No, they don't. Their real product is NOT internet searching. Their real product is advertising. The searching is just the hook that draws people to their site to be exposed to their customers advertising. In advertising in general, the rate you can charge is directly dependent upon the exposure that your venue gives. Billboard companies charge more for billboards that are along busy highways than for billboards on less-traveled back roads. TV Commercials cost more during popular shows than during less-watched shows. Time Magazine charges more for a page of ad space than Knives Illustrated does. It's the same page, the same area, costs the same amount to print, etc. But Time has more readers. The amount that Google can charge for its advertising space depends on how many people use Google's search site. In internet-speak, we say, "hit rate." Every time you use Google, you are counted as a "hit" for them. The more hits they get, the money they can charge for their ads, the money they make.
Google's initial argument was that such knives are illegal in certain areas. But do a Google search for Radar Detectors, which are equally illegal in many areas, and you will get a long list of sponsored results. Google finally admitted that their company policy to essentially to use their position as a popular, perhaps the most popular, internet search engine to advance their liberal, including anti-knife, social agenda
Do we really want the most popular internet search engine to be a company with an expressed anti-knife agenda?