Oh, it was just me randomly checking a few people who entered, and found one really naughty little winner.

What it implies: unless they clear out their entire record of non-activated games and/or multi-wins, they won't be able to use this site ever again.

As for blacklists, it is a tool to exclude people from giveaways. Since it is entirely in the hand of the user, it is like a firearm in the hands of a toddler: wielded recklessly with zero logical reasons behind it. Don't pay too much heed; there are almost a hundred thousand people doing giveaways regularly here.