Online works who are "independent contractors" probably cannot "unionize" in the traditional (i.e., NLRA) sense. Along these same lines, a strike by independent contractors (technically non-"employees" under the NLRA) would be an anti-trust violation subjecting the participants to damage awards.
An organization of "independent ccontractors" - even though not a "true union", and thus unable to wield economic weapons (like a strike) or bargain collectively - nevertheless could serve as a trade association for its members.
I agree with this. There is pretty much no way to form a union under current nlrb rules for online workers, especially with the current nlrb makeup. Without the legal force of a union, a strike would be difficult to maintain, and, well, so would any other sort of economic pressure, like a slowdown.
I am not a lawyer, just a law student, so take that with a grain of salt. I have taken both labor law and employment law, though.
A more productive mode might be to start a "member-owned" version of something like e-bay. Let the rules be set by a wiki, or something?