You free money is marketing, you choose. Doesn't mean winner of bonuses have no right to withdrawal.
I totally agree with the OP. very good point
I invite every reader here to visit my scam accusation thread
https://bitcointalk.org/index.php?topic=5474047.0
check the pic how many free roll participants Blackjack.fun has now after offering 1 TRX instead 1 USDT for the winner
pic was take few minutes ago
image uploading site