Some kids only need the honor system, but others, especially younger ones, need hard restrictions. If the parent is reasonable and the kid grows up smart, they’ll be thankful later, which is why kids also get restricted offline.

Rough analogies:

- Not letting kids buy unlimited candy ~ not giving them unlimited screen time

- Preventing your kid from interacting with “bad” kids or going into unsafe neighborhoods ~ blocking “bad” websites

- Not letting your kid watch adult shows or go to adult places ~ automatically hiding NSWF content

On the last point: if you’re not careful and your kid is unlucky, they may find shocking and traumatizing content accidentally. This is true in real life but the internet moreso (vs safe neighborhoods), even today. e.g. I regularly hear reports about Instagram recommending gore seemingly out of nowhere, such as https://www.cbsnews.com/news/instagram-violence/ (Instagram seems particularly notorious for some reason).