In the realm of corporate censorship, I still believe that politics is much less important to companies than profits. My takeaway from censorship on YouTube and other social media is that it's levied at content that could reflect poorly on advertisers. Inconvenient and controversial content more so than any specific political views. Granted, controversial does overlap with politic and especially fringe politics.

Personally I'm much more worried about infrastructure becoming closed off than any specific sites. I don't know whether companies' moderation is effective or not. I trust the market to sort that out. What would be really concerning, though, is if the underlying infrastructure starts conducting censorship of their own.

We've already witnessed this to a degree with 8chan being effectively wiped off the face of the internet for the better part of a year. Square and other payment providers have started refusing to do business with certain people and groups. I'm less concerned of a world where Facebook censors its content, and much more concerned with a world where someone can't even run their own personal website because DNS providers, payment providers, and hosting services have blacklisted them.