Despite the slightly alarmist picture of text above, 'JW leaders' always had 'strict legal control' of their copyright material, as is the case with all copyright owners. Motion picture corporations have long included 'legal threats' of prosecution for breach of their copyright, so the kind of statements in Watchtower's terms of use are not unique. The only unusual thing is the way attention is drawn to the terms of use in a manner not typical of websites.
(Why do people create lame pictures of text? And if you're going to do so, do a spell check first, and learn what apostrophes are for!)