To be honest, when first I heard it, I thought: Yes! Perhaps, finally, it's happening! What I was waiting for a while. And what I mean is the 3rd big wave, bull market up, and then collapse of BTC as the crypto leader, no more tagging to that by the rest of cryptos price action.
Blackrock will become the crypto bank or gov, call it however you want, very soon (still years) a big % of BTC will be in their hands, so they will control it, during the buy-up, price go up, after that huge collapse, they wipe out people's pocket, as usual. So the average system believer will lose again, but it will be amazing for crypto, and crypto people, to the much better projects, especially privacy coins, projects. It's a simplified, short version, but basically that's what I am waiting for, and this could be (one of) the main reason for that.
RE: Why should you care about a Blackrock Bitcoin ETF ? Because a Bitcoin Futures ETF is bad for investors.