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I wonder what is going on over at GoogleProbably a whole lot of dont-give-a-darn-about-e-mail, because it's not new and sexy, and likely doesn't drive revenue.
Also, the people who suffer from gmail spam are often non-users of gmail. I.e. neither customers of Google, nor targets of its advertising, nor sources of personal information.
Google doesn't care if <you@filleocus.com> is getting Gmail spam, because that's an outside entity whose existence does not benefit Google.
Plus, Google knows that Gmail is so huge, that nobody can just block all of Gmail. Unlike some small-time mail domain, they do not feel any risk that, if they don't take action to combat spam, they will be blocked as a whole.
If a small-time domain's machine gets listed in some DNS black-hole lists or other dynamic anti-spam databases, they have to care, or they don't get to send mail. It's a dire situation to which they have to respond.
If a Google machine gets listed in these databases, Google doesn't have to care. Anyone actually blocking Gmail machines is essentially just cutting themselves off from a huge e-mail communication hub. It's almost as if that operator were blacklisting itself.
Small fry: OK, that does it, I shall not receive Gmail!
Google: Hahaha; say bye bye to more than half your contacts, then!
In other words, Google knows that e-mail operators who are using blacklists have to pretty much whitelist Gmail servers, and so it doesn't care about blacklists.