The content of the BitTorrent network consists solely of files which people are sharing with each other and the torrent trackers are indexing. If nobody is seeding [making chunks for that file available] the particular file you're looking for, you won't be able to download it. Sometimes you might see some search results for a .torrent filetype, but if there are no seeds available [look at the Seeds column], you won't be able to download the content.
The content available on cloud servers depends on what users/artists upload to YouTube, SoundCloud, Archive.org and other services FrostWire might be accessing in the future. In addition, content uploaded to those servers needs to be publicly available [the user has not made it private] and either under the YouTube license or set as 'Downloadable' on SoundCloud.
FrostWire is a file sharing application that provides the technology for you to access content that's available online, in the same way a browser lets you access content on websites. FrostWire does not host any content nor it has influence over what content is available for download.
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