At first I thought that too but somehow it makes no sense. They gave me the loan but I can't withdraw it or repay it. But where is the catch, what they have of it?
I think they want you to lend someone first after your sign up.
Every lending site has some hidden catch or the other.
But I would suggest you to stay away from such service as you won't be able to monitor any of the lending activities in case you lend someone.
I have already given up those lending services since BTCJam's several loan defaults.