Biden's Treasury Secretary Janet Yellen — the first female to hold the position EVAH — made a buttload of money speaking to Wall Street firms. Like, to the tune of seven million dollars. $800K of it came from Citadel, the hedge fund at the center of the GameStop/Reddit/WallStreetBets brouhaha. Which, if you're still confused about, this is the best explainer I've seen. Yellen's current job is to advise President Biden on how to handle the GameStop situation. Which involves a Wall Street firm that paid her a lot of money.
Could that possibly be a conflict of interest? Press secretary Jen Psaki says, "Meh."