The 600MM number is hostnames, the active site number is 186MM. At the end of the day, we don't really feel like hostnames (non-active, parked) are relevant.
We work very hard to keep and maintain a high-quality network, and while the percentage spam is low across the network, even a low percentage can still be high volume for some.
Please email me (david+c@weebly.com) and I'll put you in touch with them, we are committed to taking a hard stance on spam.
What proportion of all websites are created by engineers, versus by normal folk?
Its pretty clear that in the long run, the vast majority will be by regular folk using tools like Weebly. Theres just Billions more of them.
Maybe the tipping point has already come and gone.
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L