The easiest, and the fairest way in my opinion, is to realize parents can and should be responsible for what their children read. Just like you wouldn't give your kid access to your BDSM porn magazines from the 80s, you shouldn't let him online without supervision.

Other than that, there is no "online harm". No root cause of anything that would need to be addressed, no problems whatsoever. It's just information passing through from one person to another.

Laws like age verification will just push kids to even weirder corners of the internet. When will 4chan or motherless implement age verification? On pornhub you see vanilla porn on the front page. On 4chan or motherless you see CP (AI, but still), (fake) rape or (fake) murders. And there are many more sites like those.