Why would any manager prioritize this when it's going to blow over in less than a day, as evidenced by other commentators saying the site is already back up?

Right. I mean, ideally, because regulations have sufficient teeth that the company's existence is jeopardized by having shady business practices. When "it's a bug" is no longer an excuse, they could have avoided such a risk by having customers buy punch cards rather than saving their credit cards, for instance.