Withdrawal is usually instant but I am sorry to say I could not use 100 feree spins though I have deposited more than the required deposit.
How much did you deposit exactly and in which cryptocurrency? As khaled0111 pointed out, the bitcoin value of the deposit that qualified for the welcome bonus is higher than $30. It's 0.0005 BTC.
Playgram doesn't have complicated terms connected to the free spins offer. They will be valid for 48 hours, after which they will expire. You can only wager the bonus on Big Bass Bonanza and the spin value is $0.10 per round.
If you didn't receive 100 free spins, how many did you get?