Hi Nothingleft,
The money they get through is frightening. My Son would get paid on a Friday and used to spend it all by a Saturday. I never found out for years what was actually happening and what he was spending it on, the amounts of money wasted is criminal, and then the borrowing used to start and never get paid back, which of course cannot go on forever.
Perhaps he needs to prove to you that he does need help and do something positive about it, he could join meetings on Zoom, they are on all the time.
Please keep in touch on here and take care of yourself.
Dx