Many "M3U" files are not actually playlists. They are executable files disguised with a double extension (e.g., playlist.m3u.exe ). Or, the link redirects you to a survey that asks for your credit card info to "verify you are human." Never download a file; only copy the raw text URL.
Reddit acts as a crowdsourced hub where users share updated links. Some of the most active communities for finding sports-specific M3U links include: m3u iptv sports playlist reddit link
Searching for an is a common starting point for cord-cutters. While Reddit is an excellent resource for learning about technology and finding community support, relying on it for free, direct M3U links to premium sports is becoming increasingly difficult and risky. Many "M3U" files are not actually playlists