It's the government trying to enforce their opinion of who should own those Bitcoins, thereby taking power away from the owner that the network has decided on, which would be "whoever has the cryptographic keys".
Intellectual property has been a thing for a long, long time. You don't literally need to have a physical thing somewhere for laws to apply.
I'm curious why you included a statement about IP existing for a long time. Is there something about the duration of existence that makes something important? Descriptive statements are notoriously difficult to transform into normative statements.