You missed to add one of the most dangerous scams where YouTube channels and VerifiedTwitter accouts offering 2× return on a fixed deposit amount.And many users losing their funds in this trap.
Recently this type of scam happened and I made a thread about that incident.
Check here :
https://bitcointalk.org/index.php?topic=5361408.0This should be branch of ponzi scheme where you get double or even triple of your investment and the frustrating part is that most of this channels looks so legit that you begin to defend them hoping the will keep to their terns and supposed only to realize you have been scammed by does hoodlums one just have to be careful with most online adverts and avoid ponzi completely