Everyone is different and maybe your friend is one of those introverts or doesn't like to do activities and socialize with other people outside the room which makes him prefer to spend time at home trying various online entertainment, actually that can still be said to be normal but what is not normal is when he gambles with an amount of money that exceeds his ability. I'm sure over time he will definitely reach that point if he doesn't immediately change his habits, so that's quite normal but it is also worrying, I doubt he can survive with the many temptations that look very tempting which will continue to encourage him to behave aggressively.