Yep it is. You can never brag it if ever you win millions of cash from it like you tell people that it's where you earn your money and bought the expensive things in life. People will still see it wrong and they will not praise you for that and will advice you to stop.
Yes that is right, it is different from person to person, if a person do not play gambling in a good way and he is losing a lot of money, then gambling is really bad for him.
Gambling is equal for everyone but those who love the money they will addict to this gambling and spoil there lives, for this kind of gamblers i will the gambling is wrong. But many people here to play gambling to come out from there work stress, and they can afford their loss for them we can't say it is wrong. Finally as you said it is different from person to person.