I was always confused who need so much free spins? I think 10-15 free spins is enough to check how the game runs and etc. What these 99 free spins are for? Even if you win, you wont be able to withdraw the winnings.
Does the history knows a case when someone win big with free spins?
Win big from free spins is possible but nowadays it is almost impossible to cash out big amount from free spins since most casinos has max allowed withdrawal from free spins. Win big from free spins needs to be wagered xx amount first before it is able to be withdrawn. It means that the bigger amount you win from freespins, the bigger amount you need to wager. At the end even if you still have big amount after completing the wagering requirement, you wont be able to withdraw all amount due to the max allowed amount to withdraw.