The second gen ones are still incredibly cheap for what you get and will most likely have a long support window (they’re still pushing updates for the old hd models from nine years ago). As far as being open source, I have done diy linux streaming or time shifting boxes for twenty years before switching to the appletv and the fact that it can connect up to a smb, ntfs or jellyfin is enough for me. Just trying to save our illustrious op some money, time and heartache.