It's been almost 20 years since the founding of Alphabet's YouTube, and Hollywood still doesn't really know what to do with it.YouTube, which effectively invented user-generated content, claims a daunting share of overall media consumption. And it's no longer just dominating the internet, it's dominating the living room, too.YouTube made up 9.7% of all viewership on connected and traditional TVs in the U.S. in May — the largest share of TV for a streaming platform ever reported by Nielsen's mont...