If there's one company that can afford the resources required to pull this off, it's obviously Google so I'm not at all surprised 😆 It's not freaking me out either, it's like typing suggestions from keyboards like SwiftKey: it remembers what you type and suggests a word you often type after the one already typed. Google just does the same but with whole sentences and language processing must also be involved. The tech is there, and they are putting it to use.