according to Cointelegraph, REX Financial CEO Greg King stated that issuers of cryptocurrency exchange-traded funds (ETFs) should carefully choose which cryptocurrencies to expose in their funds, as most cryptocurrencies are "quite unreliable." Greg King said in an interview with Bloomberg's "ETF IQ" on Monday: cryptocurrencies outside the top ten are quite unreliable, especially those outside the top twenty. Issuers need to make strict choices when selecting targets. He also said that he believes that applications for ETFs of various cryptocurrencies will not experience "explosive growth," but expects "many funds for each type of currency."