One of the supposed justifications for the intellectual monopoly called copyright is that it drives creativity and culture. In the last few weeks alone we have had multiple demonstrations of why the opposite is true: copyright destroys culture, and not by accident, but wilfully. For example, the MTVNews.com site, along with its sister site CMT.com, …
No, it would empower anybody, especially corporations, to take the new artists’ ideas and work and repackage them as an item for sale to others. Anything you share would not be covered by copyright and therefor no longer be your property.
Individuals cannot compete with organizations.
If you are already sharing something for free in order to gain publicity, what is the downside of others repackaging them and spreading them further? That is exactly the kind of publicity you’re trying to gain.