BlackRock's name has spread in the crypto world regarding Bitcoin ETF, but Blackrock is not limited to ETF only; its scale is huge.
BlackRock is part-owner of MicroStrategy
Bitcoin maximalist Michael Saylor and his company MicroStrategy are known as the world's second-largest Bitcoin owners after Satoshi Nakamoto. BlackRock holds 8.1% of MicroStrategy's shares; this automatically makes BlackRock the owner of 8.1% of MicroStrategy's total bitcoin.
BlackRock is a part-owner in BTC mining
BlackRock owns large shares in top Bitcoin mining companies like RIOT, MARA, CIFR, and WULF. BlackRock is also the largest shareholder of other big shareholders in the mining industry; for example, the Vanguard Group owns over 10% shares in RIOT & Marathon, and BlackRock owns 13.8% shares in the Vanguard Group.
The Keeper of the Keys is the winner
BlackRock itself is not owned by one person; multiple large shareholders have benefited from it, so shareholders of BlackRock are the co-owners of Bitcoin. However, not your keys, not your coins, so BlackRock's bitcoin empire is under the control of one who holds the keys.