BlackRock's Chief Executive Larry Fink told shareholders this year that digital assets, alongside private markets, insurance, and active ETFs, could each become $500 million revenue generators for the firm within five years.According to him:“Private markets to insurance, private markets to wealth, digital assets, and active ETFs, we think these can all be $500 million revenue generators in the next five years.”For at least one of those categories, the runway may be shorter than that timeline suggests.BlackRock’s crypto ETF business has already generated enough fee income in its first two...