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The average lifetime of a URL was once said to be 44 days. At the end of its life, a URL link breaks, meaning it gives you the dreaded "404 Not Found" error that most of us have seen. Irritating as that may be, it's politically awkward when looking for publicly funded research, and it's a cultural disaster for libraries, archives, museums, and other memory organizations.
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The short answer is that ARKs are the only mainstream, non-siloed , non-paywalled identifiers that you can register to use in about 24 hours. DOIs, Handles, and PURLs require resolution and other services to come from their respective centralized systems (silos).
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