If real, then do concealed. All words look like legitimate. Actually after few days you will know.

Let see how.

A real stuff is, You must be doing for real while letting more people in. 
New money actually is used for paying for new.
One more thing. They don't promise any. they only say relying on the performance after a period even with good previous records audited by accountancy and government (If this is a PLC).



In ponzi scheme, New money is used for paying for the top ONLY.  These schemes usually promise very much, the number is usually very ridiculous.

If you use sense to find, you probably know you should not take part in.