Thank you for making this very understandable.
Welcome bonuses on gambling websites are indeed real and are commonly offered to attract new players. However, whether you can withdraw the bonus or any winnings derived from it depends on the specific terms and conditions set by the gambling site.
I have received a welcome bonus once but I didn't know what the conditions were which made me give it up. At the time I signed up, I funded my wallet and picked my slot game to play. I ended up winning beyond what I expected as it was my first game. I immediately, requested to withdrawal my winnings. I knew, I had received a welcome bonus but didn't know about the requirements until I was about to make the withdrawal, a pop message warmed me that I was going to lose the bonus if I decided to proceed with the withdrawal. I didn't mind. I lost it but withdrew my winnings