Even if blackrock DID do this, it would be clear market manipulation. dump money into it, show that prices are skyrocketing, make everyone buy because "omg XRP to the mOoOoOoOoN" and then black rock sells it all, tanks the XRP market price, and everyone else gets fucked. If you're smart, you'll buy in before they dump 9 trillion into it and sell halfway through just to get your own. If your a little less smart, you won't buy at all. If you're an idiot, you're gonna buy and never sell. And wait.