So, here's a tidbit...
Telling a company what you want to see from them does not constitute "censorship." If it did, then everyone saying they want to see a new Dark Sun or Spelljammer is engaging in censorship. Companies get feedback and make choices, that's a normal process.
That you don't happen to agree with the feedback does not make it censorship. That, heavens forbid, the company listens to someone else instead of you, does not make it censorship.
This is not true, and asserting it by taking one case ("I love something, and I'd love to see more of it,") and falsely equating it to another case, ("I don't think anyone should have access to something I don't like,") does you no favors.*
If a private entity regulates the flow of information, that can end in censorship. For example, it is a facile and incorrect argument to say that there is no effect from the (private and voluntary) ratings given out by the MPAA in America. That is a fairly simple, and easy-to-understand, example of private censorship.
If that seems too abstract, you can look at all sorts of private censorship in the past; prior to the MPAA, there was the Hays Code. The fact that this censorship was done privately did not mean that it was not censorship.
In the Comics Industry, there was the infamous CCA (Comics Code Authority); again, private censorship.
There are real conversations to be had; but continuing to make the false equivalence between people advocating for more, and people advocating for past material to be removed from the market, does not enhance the ability to have those conversations.
Yes, people can advocate for private censorship. But that's not the same as, "Hey, I'd like a Spelljammer supplement."
*No one has ever said, "Hey, boycotts are awesome. Do you know why? Because they are EXACTLY like asking for your favorite ice cream flavor. So shut up." That doesn't mean that a person can't boycott, but using that analogy is facile and demeaning in that it is purposefully obliterating the very real difference in what is occurring.