Eh I prefer an open marketplace that's based on merit and not big players deciding for me. Also, they don't support vape and other legal products so my open marketplace will win in the long run since we curate a list of vetted sellers, but you can bring your own.
Also, you do realize you have AI that can vet and figure out which sellers are "drop-shipping scammers" right? Why would buyers need to pay marketplaces in the future when AI can do better vetting? These marketplaces are seeing their moats disappear and now are trying to partner up with ChatGPT to make sure they can still rent seek.
How is a service like Shopify, where any non-technical person can open a store and sell things not an open marketplace? You don't buy through Shopify anymore than you're buying through WordPress if the seller chooses WordPress for their company website. The web is the open marketplace. Shopify isn't Amazon.
Also, I don't hate the idea of what you're building but keep in mind lots of people selling stuff on services like Shopify have zero technical skills and most people who shop online are also normies who will know nothing about open models and whatnot.