Woofun AI reports that the U.S. Securities and Exchange Commission has initiated a 60-day public comment period to evaluate the regulatory applicability of exchange-traded funds targeting new asset classes or strategies. The agency notes that global ETF assets under management expanded from $4 trillion in 2019 to over $12 trillion by the end of 2025. Issuers are deploying complex structures, including Grayscale's Hyperliquid Staking ETP, stablecoin reserves, and Bitcoin yield products with covered call options proposed by BlackRock and Goldman Sachs.