Explaining the name:
The black flag represents the absence of a flag, standing in opposition to the notion of nation-states. The all-black flag represents a negation of all structures of oppression as well as the idea that a ruler or arbitrary border can represent the totality of the individuals within that border or under that ruler. As a white flag is a traditionally used, universal symbol of surrender, a black flag stands as a symbol of defiance.
"Even pirates before they attack another ship hoist a black flag."
Our nation is based on a combination of individualist anarcho-capitalism/agorism, with elements of anarcho-collectivism. No one is forced to have to contribute the earnings they make from black market dealings to anyone else, but digital co-ops exist and creative commons is the agreed upon standard for sharing music, books, software and other intellectual property.