If a person just ignores the sarcasm, your words seem to be literally correct in relation to this social network. It appears you have not gotten that it allows you to share to no people through all intermediaries to public posting with comments. That is how it is designed. The fact that +Larry Page
is letting average joes follow him is confirmation that he wants it to be used in the broadcast(twitter follow) style.
BTW It is not people who have followed you that can comment on a public post. It is absolutely everyone on google +, even someone who is not a follower, but followers will be more likely to comment because they are following you.