It is super easy to spin up another front end by copying the open source repository of Steemit and show whichever posts you want. We saw it quite a bit with Steemit copies like Steenit and Steem1t who were after Steemians keys to grab their wallet. You could totally create a Darkoverload version of Steemit if you wanted and only show those posts, and the Steem blockchain would totally work perfectly.

I don't think the argument that Steemit.com as the main interface and therefore the Steem blockchain is censored really holds up in my eyes. It's the main interface at the moment, but I'd guess that's only because it's been around the longest. Once the others are significantly better then those numbers will drop quickly.

Really interesting idea about child pornography... images and videos can be banned at multiple stages of the technology (image host, front end, etc) but if someone was posting terrible images using ascii or something text-based, there's not much anyone could do by mute the author.

I also have no problem with platforms like Facebook and Twitter removing content they deem dangerous... it's not only their prerogative but their duty. If I want to see something that isn't family-friendly then I can always go to a more adult site. If I'm on these advertiser-friendly sites, then I'd be pretty upset to see 'dangerous' or 'adult' content amidst my family's birthday posts, etc.