Dose gambling require a deposit until profits are withdrawn or without deposit ??
Looks like you are talking about a site on which they will say that you win something
(after playing with free credits) and will asked you to make deposits. Or you got a bonus from a gambling site
(maybe promotions or something along those lines)? Is that what it is? You can mention the site if you want for checking.
Anyways just like other said , obviously you need a funds to start doing gambling. You can't start without it.