

Yes, they used to, and still do, do next day delivery depending on the item and where you live. It is certainly not the norm. That forum post is also not the evidence you think it is.
Regardless, you said when Amazon started it was next day delivery. That is simply not true. Perhaps you were talking about when Amazon was first available in your area it had next day deliver, which would be fair, but it’s not when it started.
I’m curious what you’re referencing. I suppose it could infect the drives controlling chips, but a decent drive should be fine. And if you scramble all the bits I don’t see how there could be malware left