Well I don't think anyone saw that coming. In a new interview Hideo Kojima casually mentioned you can build a zoo in your Motherbase like it was no big thing. You can also attack other people's bases online.
“Of course I expected people to react, but then there are very dark themes; such as race, and revenge. That’s something I don’t want to look away from. I did see the reaction coming, but that doesn't change the message I want to relay.” Kojima on Ground Zeroes' controversy