The other approach is not to try to block out all non-approved internet sources, and instead teach your child about the dangers out there, and how to handle them.
If a young child becomes addicted to online porn for instance, it's an indication of deeper issues and it seems to be missing the point to put the blame on network operators for not blocking children effectively enough. I don't think a healthy well developed child would become addicted to porn in the first place.
That's the real challenge for parents: they don't need to be a part-time network über-wizard but rather a stable trustworthy figure for their children to rely on who can guide them through the often difficult journey of growing up.
So the burn-in hit on day 534? or why else would they test for such a weird length of time...