With regards purported MLMs, it does matter. If you have a scam product and your'e deceiving people about it's worth, then it's a scam no matter whether the business model is good or not.
Unfortunately, due to the low cost of entry not just for MLM participants, but also for companies, MLM can be a model of choice to promote a scam product - and there's a fair share of that going on.
Considering there are people who claim that the entire MLM model is flawed and nothing more than a legal pyramid scheme even if a legitimate product or service is involved there is no difference.
The failure rate of over 99% is well documented and even the DSA says that the
median annual income for those in direct sales (including MLMs) is $2,400 which is
down from the average of about $5,000 in 1998 both of which are way below the income of a part-time (20 hours) minimum wage earner of the time ($5,356 in 1998 and $7,540 today)
The moment you realize that MLMs increases the number of middle men then you realize that there is no way for every one to make money. At best MLM work like wholesale clubs where you pay a fee to get the discount of the products and that is the way most people actually use the legitimate ones.
References
Carroll, Robert Todd (2003). The Skeptic's Dictionary: A Collection of Strange Beliefs, Amusing Deceptions, and Dangerous Delusions. John Wiley & Sons. pp. 235–36. ISBN 0471272426.
Coenen, Tracy (2009). Expert Fraud Investigation: A Step-by-Step Guide. Wiley. pp. 168. ISBN 0470387963.
Cruz, Joan Paola; Camilo Olaya (2008) "A System Dynamics Model for Studying the Structure of Network Marketing Organizations" (peer reviewed paper that refers uses Taylor as references)
Ogunjobi, Timi (2008). SCAMS - and how to protect yourself from them. Tee Publishing. pp. 13-19.
Peterecca, Laura (Sept 14, 2009). "What kind of business do you want to start?". USAToday (Gannett Company): pp. 4B.
Ryan (Editor), Leo; Wojciech, Gasparski (Editor); Georges, Enderle (Editor) (2000). Business Students Focus on Ethics (Praxiology): The international Annual of Practical Philosophy and Methodology Volume 8. New Jersey: Transaction Publishers. pp. 75. ISBN 0765800373.
Taylor, Jon M. (2002). "Comparing Recruiting MLM’s with No-product Pyramid Schemes, and with Gambling". Consumers Awareness Institute.