I don't think you have to assume little is morally superior to say big becomes evil. When those in power become powerful, by nature they do everything they can

I don't think you have to assume little is morally superior to say big becomes evil. When those in power become powerful, by nature they do everything they can to maintain that power. When they were small that might be by making the employees happy, or the like but when they are big they have shareholders to answer to and percentage points to keep up. In this specific case Amazon immediately fired every single person who whistleblew or attempted to communicate their non-action on Covid-19 in the early days and the early outbreaks in warehouses. This isn't some kind of worker pay disagreement or such, the company literally got people killed. Every single person they fired was female or a person of color. The problem with big companies with hundreds of thousands of employees is the general fact that eventually lobbying and shareholder meetings lead to treating people like sheep and robots. I think there are plenty of great examples of responsible mid-size companies, but nearly every massive company has these stories somewhere and there are plenty small companies guilty of massive missteps but generally not on these kinds of scales, I suspect it's because the ceo of a small joint has to look these people in the eyes on Monday and nobody is squeezing them over the last 2%. Bezos doesn't have to look anyone in the eye and its much easier to put your underlings at risk and fire people when your boss tells you to do it.