If you have won real money through a no-deposit bonus, you will need to ensure that you have fulfilled the wagering requirements before you request a withdrawal. If you have successfully fulfilled these, then you should be able to withdraw your winnings using Bitcoin or other crypto with no hassle. However, most online casinos will have really strict withdrawal rules for no-deposit bonuses such as free spins or free casino funds. The rollover requirement might be pretty high, and you might even have to make a minimum deposit anyway before you can get your winnings.