Generally, what they compared here is losing money although it should be obvious that comparing MLM and usual gambling doesn't make any sense and is not appropriate even how to try we compare these two. Gambling and MLM have different systems and way of winning/losing.
However, we can't deny the fact that most MLM is a failures that's why the risks are almost the same as people losing money in gambling.
Whatever our view, just be wise next time and study very well what investments should we put at risk especially joining MLMs.
Yes from what I saw, the only thing that they are similar is we can lose money but the reason of losing the money is not the same. In my own experience MLM is always apply in business, recruiting people to have a membership and downlines while in gambling there's no such thing like that, I rather lose my money in gambling than losing it in MLM where you only need to deceive people.