~snip~ only 1-2&3 people have big prizes, the rest only get $20, unfortunately for them earn $20 can't withdraw need 0.001Btc for minimum withdrawal.
Only 18 participants have received $20 prizes. The top 50 players have received minimum $50, which is above the min withdrawal limit. Maybe you haven't checked the prize distribution list

. I have participated in the competition and won $50 from it. Although my balance was withdrawable without any condition, but I have placed some bets to test my luck. Then I had requested for a withdrawal. Anyway, OP has taken an action for those participants who has received $20 prizes. Therefore, those participants don't need to play the games if they don't have the habit of it.
I can send the rewards below 0.001 directly to the winner's BTC wallet. I have sent the PMs to everyone who was asking about this.
I have already lost a small part of my art competition prize in slots. Luck is not on my side this time.

Although, at first, I won a little and increased the deposit a little. I have not yet tried to withdraw a deposit, but I don't think that there will be difficulties with this. Minimum amount is 0.001 btc, my deposit is a little more. So, in principle, I fit into the limits, so I can afford to play in this casino a little more. Hope I can stop and not lose everything.

WINZ.IO is in good reputation and hence you need not be worried about the withdrawals. Minimum withdrawal of 0.001 btc may seem to high for some of the gamblers who want to withdraw daily but most people like me do not withdraw often. I usually keep the paying capital funds inside the gambling site and withdraw only when I need them to spend on some other purpose.