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I am trying to solve such an issue for someone very close to me and that the complaint he gave, I have no answer than maybe the bonus was canceled already before he made the deposit or there was a minimum deposit requirement.
Any other reasons?
think that what happened to your friend was a fraud!! i don't think it's.. because the bonus that was promised from the start must have terms and conditions that apply, it's possible that your friend missed one of the conditions that the gambling site is required to be able to get the bonus they offer, for that it is important to ask customer service in advance about the bonuses or events they are holding.
but, has your friend questioned to the CS for help on the gambling site, if they don't give an answer then it's best if your friend has to forget about the bonus, the big win that your friend got has actually made the owner of the gambling site have a little headache

We didn't know if it could be a scam from the casino or his friend did not meet up to the terms and conditions to receive the bonus. Most time, casinos do have a limit time for a customer to claim there bonus and if they do that late, they bonus must have gone before claiming it.
We need to be aware of the rules that must be taken for us to receive a bonus or else, we might become skeptical of the rules and end up failing to calm at the appropriate time. For me, most bonus should not be in a space of free hours or days before it expires. Enough time suppose to be given.