I don't see this idea profitable though. Sign up bunoses cannot be withdrawn unless you wager from your own pocket and reach the amount required to be withdrawn.
Like the people above said, there's a condition that will force you to deposit and wager with that amount to comply with the requirement of the bonus that you are trying to hit. I stopped chasing with these bonuses when the wagered amount has increased mostly for popular casinos.
Yea I fell into this trap once, one site gave like a free $30 which I then turned into $100 but then lost it all before I was able to hit the withdraw requirement lol
Because of that bonus that you are trying to get, you even lost more than that and this is now associated if you want to claim the bonus. Before it is good but today, a lot has changed.