That’s also a fantasy. There is absolutely no evidence that the masses can starve out the ruling class. It has never been done. Boycotts do not work because they starve the rulers, they work because they quantify the ability to organize quickly and thoroughly. A single boycott in a single city of a single store is enough to demonstrate the ability to organize and the ruling class will react not because they get starved out but because they know the real threat is an organized working class.

Not buying coffee will do about as much as voting will.