Same reason 4chan reCaptcha is no longer used to digitize the other word. If they had their way the correct answer to all reCaptchas would eventually become "nigger nigger"[1].

Fun times.

[1] the idea was to always write the correct word and just enter "nigger" as the other word. This eventually led to reCaptcha disregarding 4chan answers from the pool of resolving weird words.