It can be advantageous for the government to issue laws that citizens can't comply with. That way they can prove you lied because you haven't provided this one e-mail address that they were able to trace to you. Now you're a liar and they can hold that against you.
All true. This particular one has no impact on US citizens since we don't need US visas, but other overly demanding laws certainly can affect us, and even this one can affect non-citizens We care about (even ones we may count as family).
