I think the idea there is to hide them from the search engine spidering.

Humans can ignore them for being obviously spam, and most people won't even see them due to reaping, but the spider bots are very aggressive and spot them almost immediately.

In reply to Re^3: Spam! Spam! Spam! Spam! by SuicideJunkie
in thread Spam! Spam! Spam! Spam! by BrowserUk

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