I guess that it depends on the broker. However, as far as I concerned there are no such brokers who would provide their trader with such instrument like trading on a live account without depositing. If you're afraid of your broker then you need to check it before you start trading with it. You should check regulations and certifications and try to ask several questions its customer support. Usually, these two things determine whether a broker a scam or it's reliable. Afterwards you can start trading on demo and if you see that everything is clear you can deposit the minimum sum of money in order to be sure that everything is okay.