As a kid I never even considered an adult could contribute in any way to my free time and to the degree to which I will enjoy it. Of course they had a contribution but it was more akin to teaching an autonomous car to drive rather than you driving the car yourself. The end result is still a functioning car, but the implications of each case are vastly different.
Maybe the particulars of the situation made it possible. Small, safe town with friendlier people, fewer distractions available, more relaxed legal framework, fewer dangers out there, etc. But the implication that you need adults to build and maintain an environment in which kids can play is only valid if that's the way you lived it so it's the only way you can imagine it. It is sufficient but not necessary. There are plenty of other ways that don't involve parents to build their kids' playing universe. And having just one more possibility invalidates the premise of the original comment.
As a parent now I encourage free and outdoor play whenever possible. Winter, summer - doesn't matter. They love being outside and self-organize. Sure they're young enough still to want help with setting up games from time to time, but it's crazy how much imagination and natural inquisitive nature is in them. Parents overcommit kids today. Play is work now. And work sucks as a kid. Don't do that.
But the premise that communities are gone because parents aren't around isn't founded in anything but an assumption and is wildly inaccurate in my daily life.