"Authenticity" means "Fear of corporate marketing power"
Perhaps what "authenticity" means in this context is someone NOT associated with the RIAA cartels. People are resentful of this because they see it as the Evil Empire sneaking into their sacred independent territory. Genuinely independent artists usually encourage torrenting and downloading of their works and people can spread and share these without fear of the RIAA gestapo coming down on them, and people in this scene value this freedom and absence of fear. But with the major labels worming into the scene, masquerading as "independents", there comes the fear that those filesharing this work will be persecuted for copyright violation.
So what those demanding "authenticity" are really saying is "we don't want you oppressive bastards messing up our indie filesharing scene. You victimised us for copying your crap, now don't come into our arena with it and start suing us here as well!"
The other peril for indies here is that the major labels will flood the indie market with professional productions, taking all the popular top promo spots on YouTube and thus crowding out the genuine indies. We've all seen this happen in other arenas and it's obvious this is going to happen on YouTube as well.
To combat this, a video site for independents ONLY needs to be set up, with the site requiring people to agree to a clickthrough license with these provisions:
1. You testify, on penalty of infringement proceedings, that you are the SOLE creator and copyright owner of this work.
2. You unconditionally license this work for free noncommercial distribution via P2P.
3. You testify, on penalty of fraud and false pretences, that you are NOT signed to a major record label.
If the site owners then have the legal guns to sue the pants off any record label that posts a signed artist in violation of this license, we would have a site that effectively excludes the corporate bullyboys from poisoning the indie scene with manufactured artists. Such a site, given the widespread hatred of multinational corporations prevalent today, would have the potential to get bigger than YouTube very quickly.