The problem is communication, understanding each other and trust. Do this exercise: from those 7 billions discard the people who speak a language you don't understand, then discard the people who don't care about you, then discard the people who you don't care about, discard the people that interact daily with you but you don't trust, keep discarding until you are left with a list of people you will share all your secrets with. How long is that list? I will be surprised if it consists of more than 2 people, for most of us it is 0, we are not alone but we feel lonely. A machine will never betray us, it may fail and we can fix it but it doesn't have bad intentions like people do, we feel safer writing our feelings in a text file or in a notepad than telling about them to other people. And what if that text file or notepad could reply to us? A cold, non human reply that helps us feel less lonely sounds promising.