Possibly a dumb question, but is there, or could one of the extra smart people here build, a federated marketplace to allow for direct buying and selling without the middle-man enshittification of ebay, reverb, and the like?
Have a look at #flohmarkt, federated decentral classified ad software using #activitypub: https://codeberg.org/grindhold/flohmarkt By @grindhold@chaos.social