I have no objection to Facebook, Twitter, Google/Youtube, Hacker News or WeChat aggressively moderating their platform, or even running social engineering programs. Their platform, their problem, humans have lived with that sort of thing for centuries. My issue is that content recommendation systems are not transparent about why things don't appear.
Zerohedge got booted from Twitter recently. I don't mind that sort of thing because it is obvious what happened; go to their twitter page and it says the account is suspended. If Google tried something similar and removed them from the index there isn't a tool (that I know of) saying "Zerohedge has been removed from Google's index" and that is upsetting. I'd support legislation where people had to provide that sort of information in a public and accessible manner.
I suppose my big complaint is that if the big companies were organised against a group (maybe Google has an irrational dislike of Russia-based IT companies; it is possible) then that group has no way of identifying that they are being treated differently. This will always be a concern for political minorities.