Of course, but they can't be on adventures 24/7, that's the point.
Kids aren't supposed to have fun 24/7. It's impossible.
The problem is what happens the moment the "fun" stops. If everybody reaches for their phones, then that's an issue that cannot be fixed by your "just have more fun" mindset.
You are misunderstanding the addiction part here. It's not about not having fun.
There are tech companies spending literally trillions of dollars on one goal: ensuring that kids keep looking at their phones.
Your framing this as a question of boredom is really naive.