Why pay for YoutubeRed when you have this.
You can you do google login as well, and the app(not me) will remember the same. Next time you open the app, go to the profile section and hit sign in and the app will sign you into your google account. Play all you want when you want it, well since it is not youtube red you cannot pause and play yet. I am working on alternatives for the same, will be working on it in the future.