RyanS was the YouTube account of Ryan Sinclair. It was under this account that he released a video entitled "Hey" to open up about the death of his grandmother Grace. At the time Ryan uploaded this video, 37 viewers subscribed to the account. Prior to that video, Ryan discussed his dyspraxia in a video on the account at some point. (TV: The Woman Who Fell to Earth)
His YouTube channel is actually confirmed to exist in real life, and can be found here.