After a tharough seach online, I have realised that these brokers actually give bonues, where you can trade and withdraw the bonus made from the respective trades. 
1. FreshForex. 101% tradable bonus. Trade with this bonus and you'll be able to withdraw profits
2. Grand capital. $500 no deposit bonus, but the profits cannot be withdrawned, you must deposit an equal amount to the profiots made from the bonus, then trade a particulor lot size to be able to withdraw