Steemit, Busy, D.tube, and co. are nothing more than wallets/blockchain explorers souped up to look like social media sites. They look at Comment objects and render the comment.body attribute as Markdown. They let you perform blockchain operations like post, upvote, etc. But the blockchain viewers have some control over how they display information - ChainBB displays newest posts first always, Steemit hides content that has been flagged enough, etc.

At some point, everyone is going to start realizing that Steemit isn't the only way to interact. For example the witness @netuoso runs his own version of the site at https://condenser.steemliberator.com/ - he often merges in code there that has yet to make it in to the official site.