I work in finance, and this sort of setup is pretty common. Yes, I have a USB headset and camera for calls. My USB keyboard and mouse work just fine. If I plug my phone in, best I can do is charge it (slowly), so I use a wall-plug charger instead.

I could easily bypass the policy since I have the permissions to do so, but I won't. Working in the trading/hedge fund space, it's not unheard of to see employees sued for stealing trade secrets (quant models, for example). One only needs to search "citadel sues former employees" for examples.

edit: former Citadel employee; have not worked there in over a decade.