we can all at least agree on what categories we may want to restrict

nope, we can’t. lgbtq+ friendly spaces? copyrighted content? dissenting political views? some countries criminalise that, how should we tag it?

we could add a HTML tag in the header of all of our websites

broski, we had to relax the standard for what is allowed in html because nobody does it correctly. good luck enforcing this.

The only thing that would need to happen on the user side is for them to instruct their browser which of these tags should not allowed to be loaded.

who are “they”? are you suggesting direct government access to the browser? or, if it’s on the user, why would they do it?

Since these restrictions only ever apply to children

says who? porn is straight up illegal in some countries.

We can give them simple, safe and secure tools to allow them to control their children’s access to their devices

we already have those and parents are not using them.