The problem is that capital intensive industries like car manufacturing (or airlines as was mentioned elsewhere in this thread) tend to have low margins, high volume and high barrier to new entrants. This means unless you can convince a lot of the volume to boycott with you, minority purchasing decisions of people doing the math and taking a principled stance can’t really affect the behavior of the incumbents or attract new players. Then your choices quickly turn into not using the good or service _at all_ or engaging with the pricing scheme you find abhorrent.