This isn't an LG issue, it's a CBS issue since they are the developer. I wouldn't think it would take too much work to port the app to LG WebOS, though. They have it for Samsung (#1 market share smart tvs). Vizio (#2 market share) uses Chromecast so they have it too. LG is #3 market share, about 1/6 the market of Samsung and Vizio combined.