Your views on addiction are a bit basic, I suggest you read Gabor Mate, Realms of the hungry ghosts, and educate yourself on the role of trauma and addiction. People don't have a choice about trauma, it's imposed on them. Poor dopamine regulation , leading to addiction can be induced by trauma or a consequence of other conditions such as ADHD. Sorry, addiction's not that simple.
You are right, once we recognise we have addiction it's our choice to manage it. Society tries to help create environments like rehab programs to help. There is no equivalent for Social Media addiction, it is actively encouraged. It's equivalent to asking an alcoholic to rehab in a bar.
"A product should be legally addictive; otherwise you'd never use it."
You just legitimised fentanyl with that view. And every prescription opiates and painkillers 10,000's are addicted to. There's already legal precedent that disagrees with you.
I like how you have taken responsibility to manage the tech, I have really tried, but my kids are smart they know how to work around my gates, which I admire in a way. Such is the power of addiction.
I'd encourage you to share in detail how you secured your home with other parents because they are not as technically savvy as you. Perhaps there is even a product in there you could market.
The community building premise of Social Media could be a powerful force for good, like it is here mostly. But in its current form it's been corrupted by bad actors. I'd like to see it provided as a utility where the community owns their content, the revenue from ads and the fences they put around it. I don't know how to monetise that, so I guess its an opensource solution, like Linux, built by volunteers, the best and ethically driven.