Does it actually? I don't think I've seen a case study with hard numbers.

Here’s one study

https://dukespace.lib.duke.edu/server/api/core/bitstreams/81...

And of all the high-profile projects implementing it, like the LKML archives, none have backed down yet, so I’m assuming the initial improvement in numbers must continue or it would have been removed since

	▲	Tmpod 6 days ago \| parent \| next [-]
		I run a service under the protection of go-away[0], which is similar to Anubis, and can attest it works very well, still. Went from constant outages due to ridiculous volumes of requests to good load times for real users and no bad crawlers coming through. [0]: https://git.gammaspectra.live/git/go-away
	▲	bananalychee 6 days ago \| parent \| prev [-]
		Great, thanks for the link.