What he wants are just OS level parental controls. If enabled the OS tells apps that the user is underage. Like the only info is:

underage: true/false

Wero is intregrated into the banking apps we already have. In Germany the banks ING, Volksbank and Sparkasse already implemented it.

Having a house made out of bricks and cement would be useful just like how it is in EU. How many houses get destroyed because they are just made out of wood, plastics and paper walls (dry wall)?

Yes you can, by using the settings: https://start.duckduckgo.com/settings#aifeatures