There are two sides to the coin, just as you can chose which instances to use, they’re free to run their instance how they like, which is how it should be in my opinion. I think it’s a bit strong to call it censorship; it’s their website, their servers, and if enough people don’t like it they can just not post there. This is the same freedom we had with old-style forums, because there was no monopoly in many cases you could select a forum based on if you liked how it was run.

You’re right, they have moderation control over lemmy.world posts, but it’s still your decision to post there. If you feel that strongly about it you can even chose an instance that doesn’t federate with lemmy.world, they exist.

You’ll have to sign up for a new account, yes, but is that a big loss? I mean there’s no karma here, your existing posts and account won’t go away, it’ll just not be the main account you log into any more. I personally think it’s not a bad idea to have accounts on a few instances, I’ve moved around through several.