What are the disadvantages of Amway?

As a seasoned professional in the world of finance and cryptocurrency, I'm curious to understand the potential drawbacks of Amway, a renowned direct selling company. Could you elaborate on some of the disadvantages that individuals or businesses may encounter when engaging with Amway? Is there a significant upfront investment required? Do participants often face challenges in recruiting new members or selling products effectively? Additionally, are there any reports of negative impacts on personal relationships or financial stability due to the business model? It would be insightful to gain a comprehensive view of the potential challenges that may arise when considering Amway as a business opportunity.