According to @CoinMarketCap, BlackRock's Bitcoin ETFs are now the most profitable revenue source among the firm's 1,400+ ETFs, as stated by BlackRock Brazil executive Cristiano Castro, who called the development a big surprise (source: @CoinMarketCap on X, Dec 1, 2025). The post provides no revenue figures, time frame, or product-level breakdown, indicating this is a qualitative update rather than a detailed financial disclosure (source: @CoinMarketCap on X, Dec 1, 2025).