So now it's public servants military power, congressional power, and they look to enrich themselves with making (or lobbying for) decisions which affect the outcome of a bet.
You could imagine an army general that lobbies for the bombing of Iran knowing the president has his ear, and then bets on the bombing of Iran by March 2026.
But the crime the article is talking about isn't "abusing trust", it's insider trading. Insider trading is defined in a specific way. For one, as far as I understand it, it must involve securities.