Having read these, I think Steem's main contribution is that it doesn't rely on

1. Micropayments (like Yours, apparently)
2. DRM or paywalls (like DECENT, apparently)

This has been the revolutionary contribution of Facebook/Twitter/Reddit et al., in that they figured out how to publish content without forcing consumers to pay for it; it looks like Yours and DECENT are just trying to roll back to an earlier age where content is paid for directly by readers, and I don't think today's readers are interested in that outdated model.

Thanks for the overview!