The line between "addictive" and "fun" is tricky. That doesn't make it umimportant or nonexistant.

It's hard to explain black holes, especially in a hackernews text box, but that doesn't make them irrelevant.

At the end of the day it doesn't truly matter if there was intent before we regulate it. If I mix random chemicals/foods/etc and end up with an addictive drug like alcohol, we don't need to try to prove it was intentional before we start considering the harm it causes to society.