If you have the skills and/or capital to do that, yes. I suspect a lot of delivery companies enter into this deal because it's a way to get up and running, and earning money, quickly, without a whole lot of capital or expertise. The downside of doing this is that your beholden to Amazon. The downside of not doing this is that you might not have a job.

I'm certainly not defending Amazon in any way, but trying to understand why so many people are in this position, and this seems like a reasonable explanation.

Unfortunately, I have no idea what the answer might be, except that no one is going to like it in the short term.