Tyler "Ninja" Blevins, pictured here in 2018, became one of the best-known streamers as the format's popularity exploded.Robert Reiners/Getty ImagesAmazon paid about $1 billion for Twitch in 2014, hoping it would become the next YouTube or Instagram.That hasn't panned out. It loses money on very modest (by Amazon's standards) revenue.Does that mean Twitch screwed up?