Mednet.com faces challenges from competitors like cholestrol.com and Marvel, primarily due to their business model relying on advertising revenue from pharmaceutical companies while providing free medical information to users. The document discusses potential strategies for Mednet, such as adopting a more prescriptive role and diversifying its content, while warning against solutions that might harm its trusted image. Ultimately, it emphasizes the importance of maintaining integrity and attracting a diverse consumer base to ensure long-term stability and success.