All I heard about it was Andrew Garfield promoting it, saying it's important for people to see and will hopefully inspire people who are feeling hopelessness in today's world.
If it's truly a film about a population "rising up" against their oligarch oppressors, I'm not shocked it was poorly advertised. The quicker it flops at the box office, the quicker Hollywood can bury it. Don't want to give a struggling population dealing with similar circumstances any ideas...