According to Crypto Rover, BlackRock’s Bitcoin ETF has entered the top 5 ETFs by year-to-date flows in 2025, reflecting strong institutional demand and increasing mainstream adoption of Bitcoin as an investable asset class. This milestone is considered highly bullish for the broader cryptocurrency market, as sustained capital inflows into such a major ETF can drive up Bitcoin liquidity and price, potentially influencing altcoin performance as well (source: Crypto Rover on Twitter, May 21, 2025).