I wouldn't. The real world has laws and rules, and people to enforce them. The internet (in all practical situations) is lawless and completly unpoliced.

That's not inherently a bad thing (I like having an open internet). But it's not something I'd ever expose a child to.

I'd easily let my own child wander the neighborhood unsupervised, long before I'll let my child wander the open internet unsupervised.

I too was unsupervised. As a child I used to troll forums, which is like the white collar equivalent of being a troubled youth who joins a gang. But it taught me better reading comprehension, and how to type faster, how to write in different tones of voice, how to imagine other people’s point of view, how to figure out what they care about and what makes them mad, and how to sound credible when I’m clueless.

When I grew out of trolling, these skills continued to serve value to me throughout my life.

Skills like this only develop when a child’s usage of the internet is at least equal parts consumption and production.