1. Here is a quick example on why censorship doesn't work. Say you created a company around the fact that you had the best search engine. One if used, people could immediately find what they needed.
2. It worked so well everyone flocked to your product.
3. It created almost a monopoly for your company in the search industry.
4. With this monopoly power you decide to start censoring speech and filtering search to only give the "proper" response to searches because you are a leftist.
5. Net result is your search program is no longer the best search engine. It may be the best censored search engine but it's no longer the best.
6. Users are now taking more and more time to find what they really want, if they can find it at all.
7. Soon, someone smart creates a better search engine that reduces the time it takes to find what you need. One that gives you all the facts, opinions and news not just the pre approved ones.
8. The company pushing the censorship can not stop the outflow of consumers. Even if they stop other companies from growing their search engines, consumers will simply stop using the product because it is no longer worth the time.