FTP is also used in most of the world's major web sites and it can cause system usage congestion. The once-unregulated Napster music service, which facilitated free downloads of copyrighted music, provides an example of this. The massive downloads of music files were performed typically via FTP. This created a problem for many organizations. FTP is meant to alleviate bandwidth usage limitations, but left unto itself it will consume whatever bandwidth is available. When employees of corporations spent hours downloading music from Napster, they were taxing corporate networks that were already carrying heavy data traffic. FTP continues to be used because it is simple and easily deployed. It will continue to pose a bandwidth concern when its use is widespread.