The big difference with these industries is that they are global. When the Austin office becomes uneconomical, it gets wound down and the Montreal office ramped

The big difference with these industries is that they are global. When the Austin office becomes uneconomical, it gets wound down and the Montreal office ramped up, or Warsaw, or Manila, or Brisbane, or... so many to choose from in many cases. The only power workers have over their employers is to stop work. Picket lines exist to increase the cost of bringing in new workers. But you are powerless if the employer is in a position to move the work elsewhere on the planet, especially if it is a net cost saving that will earn the executives a fat bonus.