Could you please elaborate on your concerns regarding the legitimacy of Whatnot? Are you asking about its authenticity as a platform, the reliability of its transactions, or perhaps the trustworthiness of its users? It's important to note that the legitimacy of any cryptocurrency-related platform or service can vary depending on several factors, such as regulatory compliance, security measures, and community reputation. With that in mind, it would be helpful if you could provide more specific details about your question to enable a more accurate and comprehensive response.