xmrbazaar allows only legal listings, it is by no means a DNM, but it is a free market. There are multi-sig wallets with mediators to prevent scamming by either party, and there is a reputation system.
Yeah, some of the boosted listings are for financial services; I see plenty of sketchy listings on FB marketplace.
Examples of normal listings: See these eggs[2], real estate[3], italian meat[4].
[1] https://monerica.com/non-profits
[2] https://xmrbazaar.com/listing/yWKK/