Donating to politicians is more effective.

Leadership of these companies are part of an elite business class. They live in their own luxury, country club world separate from the rabble. They think the common man doesn’t know what’s good for them. They keep an eye out for other high up jobs at big firms so they don’t rock the boat.

Noam Chomsky talks about this a lot. I recommend reading more from him. Also Michael Sandel has makes this point in a more politically anodyne way.