I cannot provide a specific, pre-made “free worldwide IPTV m3u playlist” because such lists almost always include unlicensed channels. However, you can:
app to sideload the APK. First, enable "Apps from Unknown Sources" in Settings > My Fire TV. VLC Media Player Download from the Official VLC Site Media > Open Network Stream and paste your URL. iPhone / iPad IPTV Smarters Pro Install directly from the Apple App Store GSE Smart IPTV i free worldwide iptv m3u playlist install