When you first think about it for a bit, it might seem logical, but when you ponder it a bit longer, it doesn't. Censorship essentially comes down to this: some folks believe they know better than others about what those others should want. There's a fitting quote: "A censor is someone who knows more than they think you should." In a world where yesterday's "misinformation" becomes today's fact, you'd have to be pretty clueless to believe that we can determine what is or isn't misinformation.

Also, honestly, the spam filter example (and the rest of your examples) is pretty ridiculous. I don't turn it off, but I'd definitely freak out if my email provider decided to censor my messages for my own good without letting me see them. If nothing else then because of how many false positives I constantly see in my spam folder.