The question is directly related to the matter of legal gambling in online casinos. It is crucial to select a site that fulfills the requirements of independent regulatory bodies and establishments in the niche. Only a regularly audited site can guarantee that winnings are honest.
However, every player should understand that huge jackpots are rare, and not everyone will be able to hit them. If you have managed to win at least the amount you have deposited — you are a lucky one. You have played at an online casino for free. The best way is to treat online casinos as entertainment for which you pay some money and enjoy the process.