I think the value of having an automatic second opinion is pretty important -- that is, if you're submitting a song you found somewhere, well presumably that's at least two people who like it, you and the creator. If you submit your own stuff, it's only got one guaranteed fan. Given the sheer amount of original content on reddit and everywhere else, that tiny layer of peer-review simply must exist, because most original content is bad, and can easily overwhelm small subreddits (because reddit's "democracy" system doesn't work, because democracy doesn't work, etc). On hubski it's not a problem because we can ignore people. Although occasionally when we ignore people they can still interact with us. But presumably they can't shove their content down our gasping, wheezing throats.