If you’re doubtful about certain MLM companies whether they are scams (illegal) companies or legal ones, you can always check at KPDNK’s website http://www.kpdnkk.gov.my/index.php
Beware of any scam MLM, don’t be a victim of these illegal companies.
Basically, SCAM companies of MLM refers to those companies without a proper license to operate this Multi level marketing scheme. If you encountered some un-license companies out there you can inform the enforcement officer who handles this case.