Cryptocurrency network marketing companies are businesses that allow individuals to earn money by recruiting others to invest in a specific cryptocurrency. These companies often offer training and support to help their members grow their network of investors and earn commissions on the investments made by their downline. Some popular digital marketing for cryptocurrency include EON8, OneCoin, BitConnect, and DasCoin. However, it's important to note that some of these companies have faced regulatory scrutiny and accusations of being pyramid schemes.