This is not actually about KYC and from the article, those guys do not care about privacy but they are after profits. What I understand from the article is that they use others documents to probably create a new account in order to enjoy the welcome bonus that most of gambling platforms offer new users. I pity people that give out their documents to them for peanut amount.
The victims obviously have no idea of what might come up in the future. I see no reason for handling out your personal identification documents to anyone irrespective of what they are using it for. The meager amount offered doesn't worth the consequences ahead. I think it's high time people start learning about privacy protection.