Politicians don't have anything to lose from this. There is (shockingly!) nothing illegal about politicians making trades based on decisions that they know they are about to take that have a significant and easily predictable impact on the market.

By contrast, making public bets based on classified information that you are not authorized to publicize is a simple and relatively direct breach of laws regarding the handling of classified documents and state secrets.

A number of Trump's cabinet advisors have strong backgrounds in finance. At least two former hedge fund managers and one VC that I know of in prominent positions and I do not know much about American politics.