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Fortunately, this problem was solved ages ago by central routing registries. I register my prefixes and have a single object that upstreams and peers can use to build their filters for BGP sessions with me. Why can't Google do the same? ("But they're soooo big" is not an acceptable answer.)

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It was "solved" in some general sense but was never implemented widely or consistently. It was traditionally a really clunky and fragile system (e-mail forms) that ended up being really limited in its utility because it wasn't widely used.

That said, the point isn't that this is a technically difficult problem (it isn't) but rather one of human scale: altering the behavior of tens of thousands of more-or-less autonomous networks spanning the globe is non-trivial.

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