The answer to employer abuse is not isolated people refusing to work at big tech companies. You have very little power alone and while refusing to work for a company you find objectionable may ease your conscience, it does little to affect change (unless you’re in a position with a lot of power like Tim). The solution is organization —- forming a union, or banding together behind a political organization or political campaign to affect change. Both of these run very counter to many tech workers’ individualist mindsets but ate much more effective than individual refusal.