The following guide may help you check the nature and legitimacy of a multi-level marketing scheme.
Is there a joining fee?
Pyramid selling schemes often have start-up fees which are not for purchasing commercially viable goods or services since most earnings come from introducing others to the scheme.
Does the promotional literature indicate unrealistic earnings (eg “make $100,000 a month legally”)?
Promoters who make unrealistic claims risk breaking the law.
If you answer yes to (1) and (2) then regardless of whether the scheme is pyramid selling or not, you should seek financial advice before entering.