I'm going to state that at one point I was one of the young people this kind of legislation is meaning to protect. I was exposed to pornography at too young an age and it became my only coping mechanism to the point where as an adult it cost me multiple jobs and at one point my love life.
I don't think this legislation would have helped me. I found the material I did outside of social media and Facebook was not yet ubiquitous. I did not have a smartphone at the time, only a PC. I stayed off social media entirely in college. Even with nobody at all in my social sphere, it was still addicting. There are too many sites out there that won't comply and I was too technically savvy to not attempt to bypass any guardrails.
The issue in my case was not one of "watching this material hurt me" in and of itself. It was having nobody to talk to about the issues causing my addiction. My parents were conservative and narcissistic and did not respect my privacy so I never talked about my addiction to them. They already punished me severely for mundane things and I did not want to be willingly subjected to more. To this day they don't realize what happened to me. The unending mental abuse caused me to turn back to pornography over and over. And I carried a level of shame and disgust so I never felt comfortable disclosing my addiction to any school counselors or therapists for decades. The stigma around sexual issues preventing people from talking about them has only grown worse in the ensuing years, unfortunately.
At most this kind of policy will force teenagers off platforms like Discord which might help with being matched with strangers, but there are still other avenues for this. You cannot prevent children from viewing porn online. You cannot lock down the entire Internet. You can only be honest with your children and not blame or reproach them for the issues they have to deal with like mine did.
In my opinion, given that my parents were fundamentally unsafe people to talk to, causing me to think that all people were unsafe, then the issue of pornography exposure became an issue. In my case, I do not believe there was any hope for me that additional legislation or restrictions could provide, outside of waking up to my abuse and my sex addiction as an adult decades later. Simply put, I was put into an impossible situation, I didn't have any way to deal with it as a child, and I was ultimately forsaken. In life, things like those just happen sometimes. All I can say was that those who forsook me were not the platforms, not the politicians, but the people who I needed to trust the most.
I believe many parents who need to think about this issue simply won't. The debate we're having here on this tech-focused site is going to pass by them unnoticed. They're not going to seriously consider these issues and the status quo will continue. They won't talk with their children to see if everything's okay. I don't have many suggestions to offer except "find your best family," even if they aren't blood related.