The addiction with online gambling is certainly greater than when you go directly to the casino, and the reasons are obvious. You have to go to the casino in person and you can't always.
I was reading this site https://www.ctstorino.com/blog/dipendenza-gioco-azzardo-online-rischi-caratteristiche/ which gives very important information that i could not have summarized better. Online gambling is anonymous, so no one judges you and it is always ready to help. These two factors are practically lethal for addiction