Many of the creative industries look like an hourglass. On the one side, you have creators; on the other, the rest of us. In the middle, Rebecca Giblin and Cory Doctorow say there's often a 'chokepoint.'  Corporate behemoths -- be they streaming apps, publishers, tech giants, or others -- put on the squeeze, exploiting their market power to extract rents, push down wages, and push up costs.