What Irreparable Harm?

In January, Fox sent subpoenas and takedown notices to YouTube, demanding that yet to be aired episodes of '24' be taken down and that the users names be released to them. Absent compliance with their request, Fox argued that it would be irreparably harmed. Now it turns out that Fox won't be suing the uploaders after all, leaving the rest of us wondering whether Fox was really harmed at all by having the videos on YouTube, especially when it's becoming clear that such practices actually increase viewership.