I doubt I'd have the skill to write it but I've long thought something like Etsy could be interesting.

I think the federated nature of the Fediverse could do well to stave off the worst of any spamming.

But the thing I notice the most with independent sellers is that the bulk of what they're doing is networking, generally amongst friends. Which, really, is the ideal environment for goods and services to be sold.

But, since capitalism always demands the line goes up, places like Etsy inevitably abandon them and making their sites encouraging of that kind of interpersonal connecting in favor of entities which can mass churn products out.

Setting up shops in the fediverse would allow people to easily host their own shops (and not be reliant on the infrastructure of, say, Etsy) and boosting would organically encourage a web of trust since their friend is essentially saying, "I know this person; they're good." You could even have the code autotag listings with a hashtag so people can filter out those types of posts, if they don't want to.

Not sure how you'd handle federation when you first spin up an instance but, still, more alternatives are better than less, I expect.

I dunno; I think it'd be interesting.