Coming to Android & iOS over the next few weeks... Autoplay on Home! Preview a video while you scroll or watch the whole thing on mute w/ captions. To turn on/off or customize to play only on WiFi, go to Settings > Autoplay > Autoplay on Home. More → https://goo.gl/pzMY78 pic.twitter.com/Bm2pDeMqOx
I personally don't use autoplay because it counts towards your watch credit which in turn gets fed into the Google algorithm of what else to recommend to you.