From depicting a dream thief in  Inception to assassinating time-traveling targets in  Looper , Joseph Gordon-Levitt is no stranger to science fiction. In his latest guise, however, the actor is not contending with fantastical thoughts about the future. Instead, he has become one of Hollywood’s most consistent and articulate campaigners on artificial intelligence.  If you scroll through Gordon-Levitt’s social media feeds, you’re far more likely to find him posting about AI than his latest movie project. In recent years, he has spoken on the subject at UN-convened conferences, written op-eds in the New York Times , and given evidence to Utah lawmakers.  Different platforms, but Gordon-Levitt is usually preaching the same message: Big tech should not be allowed to unscrupulously profit from a whole history of human creative endeavor.…