All the listed countries have low fertility rates, increasing screentime rates, etc.
I suspect if you cornered a parent of a 2yo in any of those countries, they would not say it is meaningfully more social and child-friendly TODAY that the USA is, or Australia (for which I can speak) is.
I'm a parent in Norway (though not of a two year old). Children really do have a great deal of freedom and the country is very child friendly and safe. But still online games are displacing physical outdoor play. However the majority of children attend barnehage (kindergarten) where there are no screens and outdoor play is strongly encouraged (and only lightly supervised) so at least for pre-school children there is still a lot of physical activity.
