Americans and Brits have always been obsessed with trying to protect their children, from experience. Mainland Europe is slowly joining the bandwagon too, what with all the "Let's think about the children" talk, which never was much of an issue 10-20 years back. The wealthier folks of East Asia and Latin America behave similarly to Americans, while the not so wealthy take a totally hands-off approach, perhaps being able to do so because kids are already brought up to be wary of ads and scammy marketing. The situation is reversed in the Middle East, where wealthy parents take a hands-off approach to raising children, relying on one or more nannies, while less affluent parents aggressively monitor content (largely to prevent kids from vulgar content or hidden monetary charges).

Disclaimer: these are all just my honest observations, not assertions.