If I were in the daughter's shoes I could never trust anybody ever again, not even my future partner.
Besides that, just think what if the daughter starts doing the same things when she grows up.
It's like teaching your children the wrong things because they learn only from their elders.
The daughter aside, the world we live is full of evil people. I don't see any reason or a justification where anyone will trade another human being because they want to fund their gambling balance, that's life human trafficking. If it ever get to a point where you are ready to kill to gamble, then the person need a help and it's not a financial one, it's a psychiatrist the person need because he already lost it, like where is the human empathy and emotions.
In everything you do in this life, make sure it doesn't get to extreme. Some of the things that often result are the one reported here. I know people that are lock up in a mini guard room because they don't have money to pay for gambling and they have loss all the games they have potential win from. If you play sport betting and you visit betting physical place, that's when you will understand this thing I'm saying, people gamble on debt to pay back when they win and it always back fire. What happen if you don't bet at all, I believe they wouldn't die.