In the part where BlackRock explains the 21 million supply, it says "There is no guarantee that bitcoin's 21 million supply cap will not be changed". In my opinion, this means that BlackRock indirectly or directly wants to change Bitcoin's consensus, I don't know by what means or by putting pressure on the Bitcoin Core devs.
In any case, we know very well and there's no point in coming up with an excuse that you don't know, that BlackRock controls many companies around the world together with Vanguard, it has almost 100% of the planet in its hands.
My theory is:
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Force a change in the consensus, creating real Bitcoin vs. BTCBK (Bitcoin BlackRock)
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Use ETFs as a way to control price manipulation and much more.
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Lobby using Exchanges and companies as the main factor against the devs.
In any case, let's keep an eye on what the owners of the largest companies are indirectly trying to do with Bitcoin.