So if you deposited $100, you end up with $100 in your contributed money and $50 in your bonus money.
If you put a $100 stake on a $2 bet all of it would come from your contributed money, and any winnings would go back in there.
If you put a $150 stake on a $2 bet, $100 would come from the contributed money and $50 from the bonus money. If it won, you’d end up with $200 in your contributed money and $100 in your bonus money.
You can’t access the bonus money until you had put $100 worth of bets on with it though. I.e 2x turnover of original bonus money.
Yes, it’s worth it. UniBet is good because the stake is included in their bonuses so it’s just like betting with real cash.