Earlier quoted context omitted.
Also commodities if I remember correctly, which are regulated as well. Also there's a big theoretical and serious discussion in financial economics on why insider trading is even net bad. In some ways aren't stock analysts "insiders" with respect to your average SV engineer investing, and isn't an SV engineer who is able to fully understand a balance sheet an "insider" with respect to gambling grandma in Iowa?
My understanding is that "knowledgeable outsiders", in executing trades, effectively make accessible whatever esoteric-but-technically-public information they had to the market, and so help prices adjust toward their correct value. Knowledgeable insiders, on the other hand, can execute "hidden" trades that aren't revealed to the public market—and so don't provide information to the market. This distorts the market, m…
Of course, I wouldn't want to be the guy on the other side of that trade. But then again a casual grandma probably doesn't want to be on the other side of the trade of a multimillion dollar research team either.