"Render unto Caesar the things that are Caesar's" doesn't stop at the coins with his pics on them. All commerce in Caesar's domain is taxable by him.
The rest of the "Render unto Caesar" quote establishes that nothing is actually Caesar's and that Caesar is a big jerk that can be ignored.
Pay no attention to Caesar. Caesar doesnt have the slightest idea of what is going on. --Bokonon, in Vonnegut's
Cat's Cradle.
