The ETF universe may be expanding faster than the actual universe. Last week, the US Securities and Exchange Commission approved generic listing standards for several exchanges that cover spot-price commodity and digital asset exchange-traded products. That’s a pass for exchanges (Nasdaq, Cboe BZX and NYSE Arca) to list crypto ETFs without having to get a rule change every time from the SEC. And it echoes the regulator’s 2019 ETF rule, which allowed issuers to launch products without first getting exempti ...