Use m3u-manager.com or an analogue to split the basic playlist into categories: sports, movies, news. This will speed up loading on devices with small amounts of memory.
For a secure exchange, enable limited-life tokens. Many billing systems allow you to generate a temporary URL that will expire after 24 hours.
To quickly connect friends or family, create a QR code with a playlist (in TiviMate → Settings → Share Playlist). Scans work on both mobile apps and TV if the camera is connected.