You're being extremely inconsistent here. "Public space" is not the opposite of "personal space." I'm saying that your Gmail page is not personal, because Google has always placed advertisements and other messages on it. It is unreasonable to single out this Father's Day reminder and claim that you didn't expect mass messages to be placed on your Gmail.
Your newspaper analogy is the most inconsistent yet. Of course you own your copy of a newspaper, and of course there are ads. But a newspaper is not your "personal space," and in fact, I'm sure most newspapers had Father's Day ads.