First mention of Flohmarkt in a meme! The Fediverse needs more commercial offerings like that. Unfortunately, it does seem like it needs a critical mass of users to work but it has a regional focus, so it might work best bolted onto a regional instance with a built-in audience. I’m just unsure if it’d work on a countrywide basis or if it’d need to be on a city or county level and we don’t yet have the numbers in the Fediverse for that.