I guess there is a fine line between collective bargaining and holding a company hostage.
Remember when the cast of Friends all negotiated for $1M/episode, and they pitched it as "you pay us all, or you don't have a product"? I don't recall any public outcry that they were holding NBC hostage.
As we move toward a completely digital society, it only makes sense that the digital gatekeepers will have more leverage. Employers hate that.