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2) Give a locked down one to a teen
3) Contact your ISP to block all the porn/gambling/illegal domains and such at DNS level
4) https://github.com/stevenblack/hosts for the rest of HN users, it can be really effective if you disable DoH on most browsers
But more to the point, I’d want the companies to at least stop _targeting_ kids explicitly and take measures against Internet addiction. It goes without saying that no prohibition is going to be 100% effective.