Some dark hat guy could use the emails collected on site like this for targeted phishing attacks. Now that I have entered my email there, this reveals that I'm aware of these certain security incidents (the site reported that my email and some personal information had been compromised).<p>Now if somebody would approach me on this topic, they might have a chance of fooling me to give some further details about myself.<p>The benefit from this kind of targeting would be to avoid hitting the spam filters. If they just spammed their message to random addresses, people would flag them as junk mail and good email providers would quickly filter them out.