The Internet is a double-edged sword, presenting business opportunities undreamed of 20 years ago – and the potential for fraudulent practices on a scale previously unimagined: Ponzi, pyramid and illegal “multi-level marketing” (MLM) schemes that use the reach of the Internet to victimize tens of thousands of people. Where do cryptocurrencies and efforts to market them fit into this mix of legitimate and fraudulent activities? Help comes to us from the FTC’s recent (January 2018) guidelines on the lawfulness of MLMs, which can be extrapolated to cryptocurrencies and their marketing.