While I love all these stories of turning your friends and loved ones into chat bots so you can talk to them forever, my brain immediately took a much darker turn because of course it did. How many emails, text messages, hangouts/gchat messages, etc, does Google have of you right now? And as part of their agreement, they can do pretty much whatever they like with those, can't they? Could Google, or any other company…
Nearly zero. Hate to be the guy who says "told ya", but when everyone was mesmerised by gmail "oh how cool it is!", it was already clear why they are doing it.
Never used their services and would advise anyone the same. Not just google but any other "bells and whistles" services from large corporations.