The comments on the NYT article you linked are interesting. The sheer amount of venom being directed at Cyberbunker. It's as if people cannot imagine that multiple parties might somehow be involved within that organization (hosting company).
Also, not everybody seems to love Spamhaus, which is largely overlooked in the articles.
Missing in this is who is attacking Spamhaus and why -- what is motivating the attackers to risk eventual detection or capture. Also, it seems implied but not stated, are all of the attacks originating from leased servers in Spamhaus???