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But when we're in the community, there's no age-limiting problem. Now, we see users under 18 years old

There isn't a website in the world, including Steemit, that can stop underage people from using the site. You can work in FB too and it's also against that site's policies for children to use it, they still do and no one cares. I've seen people take more action here on Steemit, I've seen people actually getting flagged for constantly posting about their kids for example.