[majormajor]

There's still not a better alternative that I've found (searching eBay, Amazon, AliExpress) for specific niche items in some pretty broad ares, from fandom to vintage jewelry to 3d-printed or gray-market custom parts/accessories for cars. Ebay/sometimes Amazon seems better for electronics or manufactured parts; AliExpress if you're willing to gamble more, but for "accessory" things I've had really good luck with Etsy.

Whether you can turn that into a profitable public company... eh.

And there are certainly some blogspammy listings in all those venues (Amazon and AliExpress probably the worst for that), but good luck solving that without human curation - and then you're an even worse investment as a business.