That's a big no-no. Gambling with another person's money is a great way to lose that person's trust and friendship.
If you didn't know when a person is addicted to gambling friendship doesn't matter to him, he cares more about making more and more profit and try to recover his loss. Borrowing money for gambling is literally the last thing a gambler should do and if he reaches such a stage the only way to remove him from gambling is by putting him in jail
C'mon! There are other options which are not so harsh as you've proposed. I have a friend who was an addicted gambler in the past and he asked for professional help and he was cured after 1 year of the therapy. Maybe not everyone can afford a professional help, but everyone can do it himself with lots of publications and videos available on the Internet. I know it's hard to do on that stage but it's possible, because what a professional therapist can do to our brain we can do as well because it's
our brain after all.
Agree! Everything is just all in the mind so if someone is really determine to quit gambling then he/she can do it by himself. Though is going to be a tough battle but in the end you will succeed if you won't give up and look for inspiration and become motivated.