Just reading around the 'net now, I found several things of note about this.
First off, Apple couldn't sell G3s in a lot of countries because they were classified as supercomputers, and it is still illegal to export those from the US to many countries. It also was illegal to export anything with encryption software running or installed on it, which includes MacBooks, apparently.
I do agree that more than likely nothing would happen, but still, if they do enforce this and you're caught, you could end up in trouble.