The difference is that financial exchanges are already attacked every second and spend orders of magnitude more on security than random government websites.

hoping for erasure of all debt records

likely getting a corrupted stock market instead

maybe both?

What if the paperclip maximizer goes "if I manipulate the markets to send NVidia's share prize shooting up, I'll be able to make so many more paperclips?" After all, if swarms of agents can target a wiki, there's plenty else they can swarm.

Asked for Fight Club, got The Big Short.