>This is real money, real economies, and you could horribly crash these. That is also why you don't write with authority about how to build a bridge ...

Setting aside that first bit of hyperbole, I don't see the danger in the bridge example. I mean, if engineers are building bridges based on information they've gleaned from internet articles, there are larger issues at play.

As far as markets, retail traders basically exist and have existed within a massive bubble of misinformation since forever. There's a reason order flow is so valuable.