Deposit - you have 2 choice to accept deposit bonus or not - if you accept deposit bonus, your balance will be credited along with deposit bonus, if you not take deposit bonus, your balance won't changed - when you have accepted deposit bonus, and after playing some amount then want to withdraw your money, you will get a notification do you want cancel your deposit bonus? After you click that, the whole of your deposit ( initial deposit and deposit bonus) will be dissapear.
Hole story: Duckdice scam
After reading all the stories, I personally feel that it is very hard to get the 200% bonus. this schema makes you bust at the end.
Theoretically or practically it is very difficult to wage 1 satoshi 110x times. There is no any possible way for user to get any advantage from this.
Thanks.