C2C e-commerce

Yes, I would say they are. C2C websites permit exchange of products between individuals, and the middleman only takes a fee out for the listings. However, this form of e-commerce is unreliable both for buyers and sellers - the quality of the product and the safety of the transction are all their own responsibilities. There may be fraud happenings. It is important to amp up the security for this form of e-commerce to be viable.