One reason it's problematic is that people can get addicted to it, they can spend all their (& their families money), and you won't know until it's too late. If

One reason it's problematic is that people can get addicted to it, they can spend all their (& their families money), and you won't know until it's too late. If one were an alcholic, there's physically a limit to how much you can drink in one day (because you'll eventually pass out), and people will know (since you'll be drunk all the time). But one could pop into a bookie at lunch time, and lose €10,000 on a horse in one bet, and no-one, like your family, will know until the bank comes to take your house.