Ha ha, I've finally out-vagued @Mike Linksvayer on a joke!

Admittedly I misread the original joke and thought the joke was 375k years of copyrighted works liberated, but my vaguely-a-joke was about maybe that number being much larger than reality because much was in the public domain anyway. But upon re-reading the original joke I don't understand how the number of years of art history was reduced by the length of copyright either.

Perhaps the real vaguejoke is how vague of foundation the jokes are sitting on in the first place.