This is a master move though - it's kinda like video(youtube) embeds in your site. If every site could sell and have an infinite curated catalog from shopify merchants - shopify becomes both the discovery, distribution and the shopping network?
> If every site could sell and have an infinite curated catalog from shopify merchants
are you implying a scenario where anyone could create a "storefront of storefronts" using products from various shopify accounts (owned or not owned by that person)? Would be an interesting affiliate opportunity