Fair point. Though given that the OP has stated that he knows perhaps more than your average home user, he may well have a better router or may run something like PiHole or a similar service any of which may have some basic capabilities.
There are plenty of other ways to achieve the same effect. When my children were younger, I used OpenDNS to do this. I did block some of the more dangerous areas of the Internet but we had occasional conversations about what was safe and what wasn’t, how people hide behind fake ID’s and so on. We also talked about artificial social media bubbles to help them understand the dangers but in a wider context. And we would occasionally talk about people for whom these things had gone wrong.