> Some sites are already scoring IPs based on usage activity - like a credit score. It's only a matter of time until this data is collated and commoditised.

Spamhaus is nearly thirty years old and the notion of electronic distribution of IP and domain "reputation" lists is at least that old.

I'll bet my hat that the Internet "advertising" [0] industry has been calculating and determining the reputation of individual households (if not individual users) for at least a decade.

[0] The scare quotes are because its primary purpose these days is for dragnet private-sector surveillance.