Why is PI coin called MLM coin? PI Network was launched in 2019, but has been in internal testing or pre launch status, and the main network has yet to officially open for trading. Analysis of the main reasons for questioning pyramid schemes: 1. Invitation system and "head pulling" mechanism: Existing user recommendations are required to join the system. 2. Internal circulation and main network delay: unable to conduct actual market transactions. 3. Opacity of Economic Models: Compared to mainstream cryptocurrencies, economic models appear particularly vague 4. The double-edged sword of marketing and hype: Although social media and word-of-mouth communication have quickly gathered a large number of users, it is suspected of excessive hype