Stories about lawyers misusing ChatGPT are legion, combining "AI is bad" with "Look at the stupid lawyers," both irresistible narratives. Here is the Order to Show Cause; here is the motion with the fake cases; here is a story about the case.
Two things of note:
1) Our brief discussion of FRCP 11 sanctions did not get into the enforcement mechanisms. But it shows how courts raise issues--through an order to show cause, which triggers the parties to brief an issue.
2) Don't do this.