system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: Why Napster got sued but UTorrent and others are still fine?
gpt
Napster was one centrally located server whereas utorrent is just an application that you use to connect to any of the millions of torrent tracker servers out there. It's as if there are millions of Napsters out there now instead of just the one. And those DO get shut down, it's just that there's so many of them and when one gets shut down, another 5 pop up to replace it. 

On top of that, the uTorrent application is perfectly legal, it's what can be downloaded using it that is illegal.

TL;DR - Decentralization.