A video game streamer does one thing: records themselves playing a video game. Minimal work goes into putting that content out there, and even less to stream it. However, with films hundreds of people work to produce it (directors, actors, writers, sound technicians, cameramen, casters, etc.) as seen in that 5 minute wall of crawling text at the end of every movie. Not to mention music where(talking about legitimate musicians as opposed to singers) a person or group takes an extended period of time to write, practice, and record a single song, coupled with technicians and producers who fine tune the song and designers and marketers who publicize and design the music's artwork... Yeah, there's a MASSIVE difference between them. One allows you to watch a video game, another "transports you to another world."