13377x movies is one of the websites that provides a directory of torrent files and magnet links used for peer-to-peer file sharing through the BitTorrent protocol.
According to the TorrentFreak news blog, 1337x Proxy is the third most popular torrent. The reason behind Blocking 1337x is that it has the potential for misuse
or abuse in downloading copyrighted content, some service providers (ISPs)
blocked them, whether the content doesn't contain copyrights issue it is also restricted.
In any case, it is lawful to utilize proxies to download free applications on-copyrighted materials.