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That physical address will be useless, and probably easily worked around, in many if not most countries. Expecting Google to be able to use that address together with the law is a pretty US-centric expectation. I don't think most virus creators would be impacted, especially not the ones that are part of professional (criminal or government) organizations.

Even in the US, it won't always work. If you moved in the past few years, the address on your ID will be wrong.

Will they send letters to sanctioned countries? What about a PO box, or a remailer service?

Can you imagine what you're suggesting for a Linux machine? It's absurd. My box my rules, I'll run any damn code I please.