Bitcoin ETFs have seen $26.9 billion in net inflows this year, driven primarily by BlackRock's IBIT, which alone accounted for $28.1 billion, according to K33 Research. Without BlackRock's contribution, Bitcoin ETF flows would be negative, highlighting the firm's significant impact on the market. K33 Research also noted that while BlackRock's absence from the altcoin ETF market might allow competitors to gain traction, overall inflows into these products could remain limited.