The same kinds of "censorship" that you talk about coming from "the left" can be found in extreme parts of every ideology. Conservatives (probably of the rich and christian variety) have pushed many platforms to completely remove all even slightly adult content (the latest example being Tumblr), all sides of the political spectrum have been pressuring sites like YouTube to the point where no political discussion from any side can be monetized...
This is not an issue of political sides - it's an issue of politics (and society) in general.
As for the part about companies not knowing about the people who don't approve of this behaviour: they do. They know exactly how many of us there are: not enough. Losing even a single big investor will make a company lose more money than if everyone who disagreed with them completely stopped using their services.