Yes but isn't that limited to only tagging adult sites? That's great and it works but it only applies to a small piece of the stated problem. It seems to be largely social media that's driving popular support for this latest go round.

RTA is an excellent demonstration that a self categorization system can be expected to work provided it's standardized and service operators make use of it. What's missing then is granularity and a way to coerce the vast majority of sites to adopt whatever gets standardized.

Given the current browser duopoly coercing adoption should prove relatively straightforward. So we just need an RFC document and then to somehow gain public support for it.