All censorship is bad. whether it's a private corporation with a monopoly or a government doing it doesn't matter, all censorship is bad.
I totally agree with you that the government should never be involved in censoring anything, but differ on private corporations, especially as far as the internet is concerned.
The internet as a whole should never be censored. People should always be able to make their own website with whatever they want on there, even if it will get them arrested. The owners of a website should always have control over the content that they allow, though.
If the owners of a company don't want to see hate speech or extreme content on their own product than it should always be their right to remove it. If the majority of the public doesn't want to see Nazi shit on a social media site then it will always be in that corporations best interest to remove it, or people will stop using it.
All censorship is bad, but some of it is a necessary evil to keep the internet from being flooded with hate speech, gore, and CSAM. I will say that some companies take it way too far with the things that they censor, and it sucks, but it is within their right.