“Most real-world strategic interactions involve hidden information" "Tay’s objective was to engage people, and it did. “What unfortunately Tay discovered,” Domingos said, “is that the best way to maximize engagement is to spew out racist insults.”"

So, even if the next Tay has "behave in a civilised manner" as a objective function, it will be hard to implement as the ethical rules we presume in reality are not written out as the rules of a video game. In fact, they involve many grey areas and not so many strict right-or-wrong-statements.