Online gambling just made gambling easier and more accessible than visiting physical shops, I don't know of oys right to say that it leads to gambling addiction because more people having access to gambling in an easier and flexible fashion does not not amount to gambling addiction. Although it has the tendency of making people gamble beyond limits since the deposit method is easy and smooth but I don't believe it leads to gambling addiction.
Well, it leads to addiction. As you've said, it just gave everyone access to gambling easier because it's online. And when we're comfortable with things, we can do repetitively and when someone does that, it only means that there's a tendency that anyone who does things excessively can become addicted to it. That is why it makes sense that online gambling can really lead to more gambling addiction of a person. Many don't see it to them but it did happen to the others. Btw, it depends to the gambler whether they'll classify themselves as addicted or not but the signs can be seen.