@Moon reminded me of this article from a while back. https://www.dailymail.co.uk/news/article-462091/How-children-lost-right-roam-generations.html
It's sad, for sure. I lived in a pretty rural area, and got to do some exploring as a kid but not more than a mile or so from home. (That radius grew once I could drive, and while I had a snowmobile for a few years)
I worry about my own kids being tethered to the house though. I plan to live in a more urban area. I guess only time will tell