their premium members buy at bottom and sell you at the top. Avoid these at all costs. Few other things to avoid are, lending platforms like bitconnect(RIP), davor etc, McAfee - avoid this joker at all cost he is an actual nutcase and I don't think he knows much about crypto projects or have any deep knowledge of any kind on crypto, if you've been following him and his reccommendations you know this already, avoid ICO's with no cap.
John McAfee admits that his twitter account has been compromised. That's why there are questions whether he is a manipulator or a influencer. I agree that he is eccentric but he has a lot of followers so I don't know if he is telling the truth about his account being hijacked, or he is just saying it because his "coin of the day" was really a joke to begin with and a total failure.
https://www.cnet.com/news/my-account-was-hacked-mcafee-founder-tweeted/Pump-and-dump groups? We already know how premium members makes money. The only victim here is those noobs who joined this kind of groups.