I have always been pro bitcoin ETF, from many years back where the discussion came from. I do believe BlackRock is the largest fund company on the planet. Think about this...so many clients ask their advisors for bitcoin, but when they couldn't make money off of it (like with physical precious metals) they would steer them away. Now that they can (like precious metal ETFS) they will begin to start being okay with their clients owning some. Its a game changer.
Blackrock is just one of the whale institutional investors who are seeing if Bitcoin is actually accumulating at the moment, and they are not wasting any opportunity to accumulate it right now, to be honest. Even in other companies that have also been approved by the SEC recently.
Even if we say that the price value of Bitcoin is in a declining period, I can still say that the demand for Bitcoin is still high, so that is no longer surprising for Blackrock, honestly speaking.