I agree that voting with your wallet doesn't affect large companies. However, for me, not using Amazon is about ethics and choosing less evil companies. Honestly, and I think others would agree, Amazon has had a declining user experience for years now (product names are nonsense SEO soup and the brands are fake/knock off brands) and not using Amazon can be as much practical as ethical.

I'd certainly like to hit Amazon with trust busting regulations, but I have to settle with being "personally responsible" in the meantime.