> How is it going to hurt those?

In an endless cat-and-mouse game, it won't.

But right now, it does, as these bots tend to be really dumb (presumably, a more competent botnet user wouldn't have it do an equivalent of copying Wikipedia by crawling through its every single page in the first place). With a bit of luck, it will be enough until the bubble bursts and the problem is gone, and you won't need to deploy Anubis just to keep your server running anymore.