Greed is prohibited in the Bible (1 Timothy 6:10) not gambling. But excessive gambling activity may lead us to sin. Please take note of the word excessive, and may lead.
Yes, gambling is leading everybody to become greedy so it lies down to sin. It creates emotion and that's why it is being generalized by everyone that it's a sin.
Well, it's still an activity that each individual has the power to conquer its negative effect or allow it to control us which is making the others to have a bad ending.
But at the end - everyone quits alcohol - they leave gambling and they leave adultery as well.
There is no goods attached to it.
Moderation you are right is important but than again there is no control over one's emotion while being into it. so better safe than sorry
There is a huge difference between quitting because you have decided to do so and quitting because you're forced to, it is true that addiction cannot be sustained for long regardless of the amount of money that you have because at some point your money is going to run out, however a person that is still addicted to something will spend whatever money they get into their favorite addiction as soon as they get it, so even if they are not spending as much money or time as before they are still addicted because they cannot control themselves, so they still need help in order to overcome their addiction, otherwise they're never going to improve interleaved that addiction behind for good.