I understand, something similar happened to me, I made good gains on bonus purchases although the amounts were smaller.
I can confirm that this happened to me in several casinos, after achieving good wins when purchasing bonuses, then when I insisted for more, I ended up having those bonus purchases completely flawed and losing everything or almost everything.
I still managed to make my withdrawal a few times, but it wasn't always like that.
I agree with you, the casino chooses the time of your prize and based on the knowledge of your way of playing, the more you show that you are not coming to make small withdrawals, the more the casino sets up this strategy of deceiving you with some winnings and then giving the blow, 😉
They know what they do
If it goes wrong, the money won comes from defeats of other players
Unfortunately this is how the casino works 🤷♂️




