alt Hacker NewsFor what its worth this header has been around for a very long time. It's actually the second iteration and much simpler than it's predecessor.
Parents today can accomplish what you are suggesting by installing parental control software and only allowing access to things they explicitly approve.
This can also be done via headers explicit blocking of all the things and was suggested in another thread. [1] Some people liked the idea.
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codedokode • yesterday at 8:51 PM
The point is that it is unrealistic to expect millions of people to mark the content. Also, the header is better than the metatag because it can be added to images, videos and other non-HTML content as well.
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Again, RTA header doesn't work because it's a blacklist, not a whitelist, and also because it's only granular enough to say "this is a porn website" and nothing else.