Which products and services am I allowed to sell via the Circles Marketplace, which not?

Circles reserves the right not to publish ads or to remove them from Circles Marketplace if there are indications that the advertised product is not for sale or is otherwise being offered in an illegal manner, or if there are indications that the ad is being or has been placed for improper purposes. We can remove ads, if they have sexist, rassist etc. background or connections, they are against science, seem like scam, and have unserious offers.