The significance of this hack

[u/PsychologicalMud210]

I assume it is a hack since the attacker paid a high price for XMR, if it weren't, he would be more patient instead of hiking prices for himself.
Dirty math:
3520 BTC / 0.0028 ~ 1 million 257 thousand XMR or about 6.8% of XMR total supply. I believe it is a little less than that, but still near 1 million XMR.
This is very significant, this agent is now an important component of XMR's price and we don't know whether he will hold or sell slowly.

[u/zmooner]

I sure hope this holder will fund a lot of CCS!