I deal with an SEO service for my site, although at the entry level.
There is nothing impartial about search results. They can be manipulated or "optimized" by a variety of techniques. Bigger companies put more resources against SEO in an effort to look good in Google and other search engines.
Of course, Google is dominant. In my case, with several sites, Google represents about 92% of searches and Bing is 4.6% and Yahoo is 1.4%. DuckGoGo and several European and Asian search engines add up to about 1%.
Add in the searches that have many paid listings ahead of what you really want, and the question of fairness arises. One interesting thing is to search for any Intel device driver in google, such as a LAN Card or an Intel SSD: you get five to ten third party sources for the driver before the legitimate Intel site, some of which insert bloatware into the download and installer.