According to Eric Balchunas, the popularity of Bitcoin spot ETFs is leading to a new phase where issuers are creating customizable crypto ETF products, allowing investors to tailor their exposure by combining, adding, or subtracting assets within the ETF structure (source: Eric Balchunas via Twitter, May 2, 2025). This trend is expected to increase trading opportunities and liquidity in the cryptocurrency ETF market, with more sophisticated products designed to match diverse investor strategies.