Do you realize how hostile the outside is to non-adults? Like genuinely I've seen people call the cops because there was a kid riding a bike unsuprivized in a suburban neighborhood. Malls are dying and there's nothing to replace them as a meeting spot.
This isn't even getting into the seeming requirement to spend what feels like 100$ to see a movie now or any of the other stereotypical hang outs. Or how many people have parents that simply do not have time to drive them places.
I'm genuinely interested in your response because I genuinely think the world has become actively hostile to kids being kids.
You're still ignoring the core problem in that children can't do any of those things by themselves anymore and all of them cost some amount of money with the exception of playgrounds and parks. Growing up the closest one to me was about a 30 minute drive so I would never be able to get myself there.