Syscoin was originally a decentralized marketplace and had a CLI implementation called Blockmarket but it just wouldn't scale. They have changed and bolted on to their tech so much since then that it's a mess that's trying to push itself as a Bitcoin L2 now.
Good-old Syscoin. Never thought it had a decentralized marketplace of its own. I guess the team didn't advertise the feature so much. With tokens and NFTs gaining traction, it's hard to believe single-purpose Blockchains will rise all the way to glory (except Bitcoin, and Dogecoin). I'm talking about chains without smart contract features. These days it's all about token-based "meme" coins and NFTs. People won't care about decentralized marketplaces if it doesn't make them money in the short term. They're interested in getting rich quick. Not in the tech itself.
I sure hope existing decentralized marketplaces don't go away due to low popularity. We need as many alternatives to centralized marketplaces as possible. In countries where authoritarianism limits freedom, decentralized marketplaces' censorship-resistance does wonders. Not everyone can get access to eBay or Amazon, though. The future is filled with uncertainty, so we can only hope for the best.
Syscoin still alive. that's cool. BitBay used to be popular in the forum and they boast their decentralized marketplace too but now i can see their coin is not in any market anymore. i still can see the marketplace is alive though only the barter and p2p that has products on it.
there's never something like this with a huge community using the marketplace. if there is a community that might make a decentralized marketplace work, it is probably doge community.