They've been scrounging for a long time now, but have had little to show for it. Years ago I'd arbitrage between a handful of exchanges, keeping fiat only on those where I'd have a chance of legal recourse - and the bitcoin only showed up just in time to execute the order. So over the years a bunch of those exchanges have gotten popped by hackers, which means those transaction histories got sold on the carding forums. Interestingly enough, the only impact that had on me was a few Wall Street outfits reaching out to buy large blocks off-exchange. How'd they get my number, ya think?