Young Rich Listers Winston Wijeyeratne and Selvam Sinnappan, the founders of mattress company Sleeping Duck, have slammed their rivals for using dodgy marketing strategies to trick customers.

They look like legitimate review websites, ranking mattresses based on quality, popularity, durability and comfort. But sites such as thebestmattress.com.au and top5bestmattress.com.au are, in fact, owned by two fast-delivery mattress companies.