That might be the case. However, the point is the motivation of the Fed to pursue this case. Most countries in the West might not nominally apply censure, but copyright, trademark, and libel laws are a complex minefield that the press and anyone politically active must carefully navigate, lest the Powers That Be use it to gleefully sue their opposition and pesky dissenters into oblivion.

I appreciate that they used the least original means of criticism that was never-the-less sufficient to agitate the Fed into threatening legal actions.

It's easy to agitate a federal agency if you do something novel or extreme. The fact that this was sufficient really highlights how petty the Fed's actions are.