But the fact is, Chase could easily have said "no." But for many, they said "yes." No gun to their head. No trickery. No fraud. The complaints are, or will be if Chase doesn't follow through, Chase went back on their word which was freely given under no duress. I don't think many of us would feel put out about an initial denial of this deal. It's just the saying "sure, you've got it!" and then turning around and saying "sorry, I didn't mean that" that would be a little annoying.
(On the other hand, I do understand where you're coming from. It's a bit hard to be sympathetic to one who is indignant about not getting a bonus they technically shouldn't have gotten in the first place. )