I have long thought that all content (local and remote) should be properly labeled with metadata. Just like the cans of soup in the supermarket, you don't have to open it to find out if it has peanuts, lactose, or MSG in it; you should be able to filter data before accessing it.

You could define a set of 5 or six categories (nudity, sex, drugs, violence, etc.) and have a scale from 1 to 10 for each. Each content producer would rate each category according to defined criteria.

Then each user, or their parent, can set what their own acceptable level is. If you set your violence level at 4 then nothing level 5 or higher will load.

There are some showstoppers here, though. You have to either:

A) Change the laws in all countries (a non-starter), or B) Restrict access to only countries that obey those laws

And Option B is a non-starter to the freedom crowd.

Not to mention all the other issues with labeling, such as:

A) How to label in an internationally-agreeable way B) How to prevent abusive mislabeling

It's fraught, this path.