eBay introduced sorting options such as "Lowest Price + Postage" which undermined sellers trying to slip-in excessive shipping costs.

Plus on eBay the shipping charged by each seller is clearly listed on the Checkout page. Amazon just lists a total shipping cost for the order and I have to remove and readd items to find the culprit charging too much.

Well, 'had' to. Now I just avoid Amazon and its dark patterns. eBay is still rather Wild West but it's sellers trying to rip me off, not the platform.