As this project appears to be fairly unknown in the fediverse still, I’d like to use this opportunity to advertise Flohmarkt. This Fediverse equivalent of Facebook Marketplace already has some instances up and running - see here: https://codeberg.org/flohmarkt/flohmarkt/wiki/flohmarkt-instances
This! It’s just the name of the software, not sure why everyone’s getting so worked up about it.
I think it’s a brilliant use case for federation, hope this sees some adoption!