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More likely, I'd guess based on past experience, it's that someone wanted to take down one of their customers, and decided (or found) that the weakest link was the DNS provider.

It could also be an attack against one of their customers, again for the same reasons. DNS is a very weak point of the overall system so a very good place to target.

My guess is one of their customers was being attacked–and this was the easiest route to get to them.