Roku has dropped YouTube TV from its channel store, making it impossible to install the service on any Roku device. This is due to a dispute between Roku and Google regarding the terms of their contract renewal which the two companies have not been able to agree on. Roku has chosen not to remove the YouTube TV app from devices that already have it installed, but they warn customers that there is no way to reinstall the app, should they choose to uninstall it or reset their Roku device.
So far, the regular YouTube app has been unaffected. It remains in Roku’s channel store and can be installed on any Roku device. That said, several of the agreement terms revolve specifically around the regular YouTube app so it may be the next one to be dropped. My guess is that the YouTube app and YouTube TV app are on different agreement timeframes and that the YouTube app agreement simply hasn’t expired yet.