Other than using them very often, I have little knowledge about computers and how the internet works - so my comment is made with that background. It seems to me that if you want to censure the internet and control content, search engines are the place to start. Most of us just type in what we're interested in and sort through the search response. If something important and relevant is not included, we may never know about it. Do all of the different search engines survey the internet independently, or do they use some common mechanism? How is it decided what is filtered and what shows up?
I am not any kind of expert on the issue, but I think that most use similar techniques. However, many less popular search engines actually use Google as their base search engine, and present the results as their own.
Google, BTW, does filter it’s search results, using very sophisticated software AND a fair amount of human intervention (in the software, not for each search). That filtering and intervention, from a political perspective, ALWAYS favor the Leftist agenda, reflecting Google’s own corporate political bias.