I second the notion that holydarkness puts. As a user of freebit for a few years, if at any point it said, hey you need to sign up for this other website to claim your prize, I would either not do it, and just not bother with the lottery anymore (which I already don't buy lottery tickets), or I would get upset that I would HAVE to sign up for ANOTHER account. Then I would disable the lottery under settings.
I was aware even before I made this account that this thread existed, and even read it on and off. I was a "silent reader" as he said. And I preferred it that way.