* David Gerard dgerard@gmail.com [2013-01-20 22:23]:
The MediaWiki captcha is literally worse than useless: it doesn't keep spambots out, and it does keep some humans out.
I can't speak for WMF sites, but on my small wiki, it *does* keep some spambots out. Not all of them, but it is still quite useful to have captchas there.
Regards, Thomas