I don't know what you mean by traditional anti-abuse (typing over two words from an image?), but switching IP addresses rapidly, while staying recognisable as o

I don't know what you mean by traditional anti-abuse (typing over two words from an image?), but switching IP addresses rapidly, while staying recognisable as one entity because of the unique cookie, is not normal user behavior so this would be trivial to filter out for something like Anubis and require another solve. Maybe that's what you meant though?