tl;dr: Independent researcher Derik Kauffman discovered a hard-coded "grey list" of over 100,000 words and phrases embedded in Apple's iOS that its predictive text and swipe-typing won't autocomplete. While some entries cover drugs and sexual acts, the list also includes politically sensitive terms like "Trayvon Martin," "Kashmir dispute," "Tibetan independence," "the occupied territories" (in Hebrew), and "the Hamas movement" (in Arabic). Apple says the keyboard is designed to avoid offensive suggestions, and users can still manually type any word.