Problems with gambling is they are difficult to control myself to stop playing, many gamblers who do not want to gamble, but in the end they play back. This may result in the absence of other activities to do so triggers the return of gambling.
It's easy to control gambling habit, and the solution is already in your post, you just have to find more activities so you won't have time to gamble... Doing nothing the whole day would just give you the idea to gamble since you can't find anything to dedicate your time to...
People like that need to go rehabilitation. It is simple, one sees the gains and losses. If you spend more than you have, you need to quit and STOP visit gambling sites or similar. Why people like lose tons of money for anything
Man always wants more, and we are not contented with what we have... Just take a look at those who renovate their houses, they have a beautiful house already, no design flaws or whatsoever, but still, they will repair it and redesign the house spending too much money, that's a good example of a man not contented, same as in gambling, we face problem in it because no amount is enough for us when we are betting and winning...