It depends on us if how can we handle our bitcoin. There's a lot of illegal activities that can offer to us. We must have self discipline on handling our money like bitcoin here. Some gambling site offers to get more and to earn bitcoins. Note to yourself! Use your bitcoin properly and legit. 
The thing you have mentioned about gambling, is it illegal to do gambling in your country? Or else that is just a normal way to work for your bitcoins and to have some fun with it. Also it is going to depend on how you are going to look for those illegal things and use your bitcoin with it. But I say, it is better to stay away from those activities.