Except that's not what's happening here. When doing anything on the internet "how are you going to control spam and obvious trolls" is question #1. Twitter has an answer to that: we mechanically and/or personally identify spam/troll content, and ban their creators.

Now, many people want them to stop doing that. Which they decline, since they KNOW what will be happening in that case.

So, if you think you can do a better platform, while disregarding the (minimal) lessons learned from Twitter (or Reddit, or...), go ahead! You will fail, not because "criticism of the original platform is off-limits", but because it's a well-known anti-pattern.