One of the major reasons why Prometheus Bound has remained so popular throughout the centuries is its depiction of sacrifice: Prometheus seriously puts himself on the line for the sake of puny humans. Sound familiar? If you're at all familiar with Christianity, it should: Jesus sacrificed himself for… yep, the sake of puny humans. He was even nailed to a cross. But the stakes are a little different, here: sure, humanity is saved, but Prometheus is also standing up to Zeus. So is he really doing it for humans—or for himself? And if he's doing it for himself, is it really a sacrifice?
Prometheus ought to earn serious kudos for his sacrifice.
When the Chorus of daughters of Oceanus comes to see what's happening to Prometheus, they are putting themselves in harm's way for his sake, which in itself is a form of sacrifice.