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I can appreciate that these nations have been placed under sanction, but theres a few things that the US gov should probably keep in mind:

1. Its very easy to get around this denial of access: just use an open proxy from an IP thats not banned
2. How does the US gov measure whether or not a site is major enough to warrant putting specific restrictions on its export?  Surely the correct measure would be to determine how useful the code is, as opposed to the volume? With this in mind, surely every Linux distribution should also ban those IPs?
3. Will the US gov now prosecute any bloggers/ “small scale” producers of code who don’t conform to this law?

Maybe once this is done, a proper attempt at getting dtrace across might happen. After all, something like dtrace is highly desirable on any operating system.