For two decades, YouTube has tried to convince advertisers that it’s the future of entertainment. The pitch has always been simple enough: “Young people don’t watch cable; they watch YouTube.” It doesn’t exactly require a PowerPoint presentation.But YouTube has had problems making its case. The first is that the vast majority of videos on the site aren’t filmed to Scorsese-like standards. “The biggest knock against creator content is that it’s low quality, s---, crap, slop, garbage,” Doug Shapir...