There have been a lot of things done in the USA to make unions worse. Such as the Taft-Hartley act which placed significant restrictions on union power. This isn’t the fault of unions but of state power meant to weaken unions as a concept. Whatever flaws there may be with unions in practice in this country, I believe they still do offer an opportunity for workers to directly advocate for their needs in a way that has real consequences for an employer who tries to trample them. This is what Amazon is opposing. If you have an issue with how unions are implemented in this country, complain about that. But don’t misunderstand the value in workers rights.
> What workers' rights are being violated when Amazon decides who may or may not be a future employee at an Amazon warehouse?
You can try to distill the action in to its parts to rob it of its meaning. I could say “I’m merely holding this pointy object and moving my hand forward? Surely I should have a say over how I move my body?” But you would know you’re being stabbed all the same.
I don’t know why you want to pretend like Amazon’s efforts to crush unions are valueless. Workers are human beings who deserve some control over their workplace. Amazon is trying to prevent that. That’s what I and many are calling out as wrong and worth opposing.
EDIT: By the way the issue is not just about amazon’s hiring practices. I am referring to the wide variety of anti-union tactics Amazon is using to interfere with labor power. Take the point of this article. Amazon will try to make donations to sway political power in their favor so they can continue to get tax breaks without unions. These individual actions can be imagined as devoid of context and valueless, but the point of this action is clear: Amazon does not want its workers to have a say in their workplace.