It's worth mentioning that there was also a very controversial post on HN about Chinese game companies having to do exactly this. There were discussions about things like using cameras and machine learning to verify someone's age but that also is putting a camera into the room of a child (nothing can go wrong here...). There are people condoning as well as advocating for these systems. But I think we're coming to a turning point in our society where we are going to either abandon privacy all together or shift away from surveillance capitalism. Either option will have dramatic changes on our society.

https://news.ycombinator.com/item?id=28356141