this feels like something /you can do on your servers/, and that other folks with resource constraints (like time, budget, or the hardware they have) find anubis valuable.
Sure, didn't mean to imply Anubis wasn't an alternative, just was clearing up that there are options beyond source IP rate limiting, which several people seemed to be thinking was the only option because of comments about rate limiting not working because it was coming from 35K IP addresses.