Yep, it depends on the owner who create this site too.

If they're someone who really hate gambling because it's bad, forbidden by many countries and religion, there's no problem to use quitgamble domain.

But if they're someone who being neutral or even support gambling, they should use a better domain e.g. gamblehelp, gambleguide, gamblecontrol, stopaddiction etc.

What I see the domain and content are contradicts each other.