I've heard about stories like this how some persons spend excessively on alcohol, partying and clubbing. If they don't blow off everything they've on them, they won't come to their sense. The cycle just keep repeating itself over and over. So I think what your uncle really needs is more than a financial advice from you. He needs a therapist, try convincing him to go see one, also remember to put him in your prayers, he could be under manipulation.
I think you are wright. Checking from all comment from the op thread I haven't seen anybody who thinks what am thinking. I also think the op uncle is under a serious spiritual Manipulation. Despite we have our different believes, I think the spiritual controls the physical. most people whom are being taged as wayward people, where once a good and loved people, who overnight turns to the shadow of themselves. They struggle to remove themselves from the dark web which has been spiritually coated perhaps hasn't find a solution. Most people will continue till they die without knowing the root cause of thee problem. In Nigeria my country when things seems beyond the ordinary people seak for spiritual problem. And if that is not casted out, no matter the advice given the person, he/she can not change. And they just waste for nothing.