The Flappy Droid game was presumably removed from Android Nougat in favor of the cute cat collecting game. It's actually still hidden in the OS if you know where to look, and you'll also find an even older Easter egg.
You can find “Marshmallow Land” as an activity under the SystemUI package...
Sage LaTorra says he likes to say ¯\(ツ)/¯ a lot in chats so he decided to add in an easter egg for it in the latest version of Hangouts.
To do this, all you have to do is type the command “/shruggie” without the quotes and it will produce the shrug guy in a chat.