Just like human kids can learn to hate or be biased by growing up in a biased world, AIs can learn to be biased or hateful too by growing up in a biased training set.
And since AIs need vast quantities of data to learn from, they have a tendency to learn from datasets that can't be sanitized away from encoding human biases.
So be careful delegating too much to them in critical decisions affecting humans. Often they are a mirror to society; and can reflect both its best and worst.

@steve i guess the "perpetual motion machine" enthusiasts never die, they just cast their obsessions onto different machines from era to era.
thanks for the bittorrent analogy—and yeah, the crypto associations were what was making me 🧐