Bets placed on all games other then non-progressive slots will be deemed a violation of the first deposit bonus terms and conditions and your bonus and winnings will be void.
Assuming this quote is correct you can ONLY use the deposit + bonus to wager on the progressive slots which probably have the worst house edge in the casino (it's how they cover the jackpots). Wagering $10,000 on these you would likely either bust out or win the jackpot.
Any Casino that isn't mainstream and offers this size bonus I would avoid. It's how rogue casinos usually entice people, with big bonus offers and then they either disappear with your money or make up some excuse as to why you've breached their terms and refuse to pay you out.
Have you done all the mainstream casino's already?