Monero is a community project. There are no official websites, only community contributions and consensus. Sure, some sketchy sites are inevitably going to be listed on Monerica, but it lists which have been verified as working by the site owner, and they show reports of scams. Here[1] you can see a list of projects that accept Monero donations.
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/