That's a true statement; but many companies that do terrible things make all their money not from the rich but from the middle-class and poor

Lots of people voting with a few dollars each adds up and will get their attention.

Will it? https://www.youtube.com/watch?v=kmtm9CSLjaQ

Wealth != purchasing power.

The 1% might have 80% of the nation's wealth tied up but the middle class and the poor have all the purchasing power.

So long as they're intent on saving a buck whatever the cost, corporations will pander to them just as hard as they possibly can. No matter the human toll. Walmart treats their employees poorly because that's what has to happen for Walmart to work like it does, and just wow does everyone love it. Walmart could go bankrupt in a year if everyone just started shopping at Target. But nobody does because it's not their problem.

Even if there is a great disparity in wealth, if the company in question depends upon selling products to the poor or middle-class, then this sort of strategy might still be effective