Thank you for that. I actually set up this "marketplace" two years ago, and it is essentially just a directory. Since then, we have had various discussions with different people about setting it up on a Nostr basis. However, there is a fundamental problem with that. It needs to be moderated to some extent, and certain types of products are (Islamically) not allowed. For example, I cannot let people sell red wine through it.
The fact that it's a Bitcoin marketplace is actually just a side note, as it is the most halal form of money.