Malaysia’s Prime Minister Anwar Ibrahim is usually seen in carefully choreographed meetings with presidents, kings and regional leaders in Putrajaya. So it was striking to see him instead riding through the city on a casual live stream with Sneako, the controversial 27-year-old American streamer and Muslim convert whose appeal to mainly young male audiences has made him an unlikely cultural figure. For more than an hour on Friday, the live stream gave Anwar a rare chance to sell Malaysia, his...