Anubis is a compromise. Anubis uses a Proof-of-Work scheme in the vein of Hashcash, a proposed proof-of-work scheme for reducing email spam. The idea is that at individual scales the additional load is ignorable, but at mass scraper levels it adds up and makes scraping much more expensive.
The "Parking Lot" Insight:
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Scientists are also concerned that this announcement is a politically-motivated move in the new international race to the Moon.
Space exploration