Yes, I worked in one union job - at a different point of time in my life also a guild. They improved my quality of work dealing with exactly the kind of predatory companies we're talking about here.

From what I gather from your comments, yours must have been a horrible experience (why?). It doesn't cancel the fact that these Amazon workers are being squeezed for a competitive edge in a company that's already a monopoly - in several sectors. They need to battle for fair working conditions which is exactly what a union will provide.