Come up with a few categories and let the browser/OS decide.

Websites by default are ‘true’ for every category, unless they specify.

Categories are, for example of some: nudity, sexual, violence, etc.

It doesn’t have to be perfect but sites will have to err on the side of caution.

We could even create an html tag <restricted type=violence> for example, and the browser can simply not render that portion of the page of the user has that type disabled.

And we could give companies a pass for best-effort categorization using tech to assess user-generated content, along with allowing users to flag their own content as “safe”