BuddyPress.org

The code from this post is the correct one:
https://buddypress.org/community/groups/how-to-and-troubleshooting/forum/topic/buddypress-spam/?topic_page=3&num=15#post-69499

Replace example.com with your sitename.
And yes, it works just fine on my site; no bots are getting through
But lately I’ve been getting slammed by human sploggers. That’s a tougher nut to crack.