[franga2000]

What do you think is more likely? That your child will stumble upon, correctly identify and successfully exploit an in-app webview, or that they will simply type "4chan" into Google on a school/library/friend's computer/phone?

Unless they are under constant supervision, they will find a way to access what you're hiding from them. And if they are, well then you don't need technical blocks in the first place, do you?

[sgc]

If I can slow my kids down by a year or three, it's well worth it.

[franga2000]

Does it take a year or three to walk to the school library? If they're young enough that that isn't the easier option, then there's no way they're capable enough to execute a relatively complex technical exploit.

I'm not telling not to worry about your kids' safety. I'm telling you not to worry about them dying from a lightning strike because they walk to school next to a 6-lane road full of drunk drivers every day. If they're going to get hurt, it won't be through the most complicated and least-likely way possible.