I paid a friend, designer, or freelance writer for their work. Don't I automatically own full copyright and IP rights to the work because I paid for it?
Think about the last time you bought a book. You own the paper and ink, but not the author's words or thoughts. The same holds true for all other intellectual property such as design work, photos and other written content. A transaction in which someone wants to handover full IP ownership of their work to you is incomplete unless it's formally and explicitly transferred.