There's usually a thin line before answering this kind of question, as it varies depending on the occasion and the reason for the said crowdfunding. On the one hand, I'd say that it's irresponsible to become bankrupt due to gambling; you're addicted and need professional help. This doesn't apply only to gambling but to anything that occurs in excess, such as compulsive shopping and so on. Personally, I'd rather not help someone who brought this on themselves, but on the other hand, some other serious issues might be underlying that led to the state that he needs to ask for crowdfunding. Thus, in my opinion, we shouldn't be too quick to judge, as there might be some serious conditions, such as medical, and the dire need for money led them to such compulsive behavior. Would it be justified? Certainly not, but we can't judge until we're in their shoes.
If there's any serious medical condition that's why a gambler need to ask crowdfunding, it is better to explain and elaborate it first or seek medical advice from the experts. In that way, maybe people will help him, But if the reason is about being an irresponsible gambler, don't expect them to help you. I get it
that it depends on the occasion and reason, If a person loses money in gambling in multiple times to the point that their physical and mental health is at stake, meaning there's really something wrong, he needs to know in himself that something is wrong and he needs to stop whatever is the reason why he is experiencing this.