Amazon's "partner, copy, and unseat" business model of dealing with vendors may not be the most friendly but it certainly is effective.
It's hard to believe but we're at a point where Amazon has just about as many shipments as FedEx, UPS, and the US Postal Service combined. I thought that this day would take decades more to hit but Amazon has enjoyed some serious traction in the preceding years so good for them!
https://www.axios.com/amazon-shipping-chart-fedex-ups-usps-0dc6bab1-2169-42a8-9e56-0e85c590eb89.html