Because GitHub is not a streaming server. The channel URLs are often scraped from public sources. When the source changes, the GitHub link dies.
Important: The majority of M3U lists found via “listas m3u espana github top” contain streams that infringe copyright because: listas m3u espana github top
GitHub is a code hosting platform, but it has become an unintended repository for M3U playlists because: Because GitHub is not a streaming server
Many developers and hobbyists upload M3U files “for educational purposes,” though the streams themselves are often unauthorized rebroadcasts of copyrighted content. Many developers and hobbyists upload M3U files “for