In another spell of negative publicity for Uber ahead of its IPO debut tomorrow, Uber drivers are going strike with demands for pay increase and better treatment. Lyft drivers also joined Uber drivers in the strike. Uber says it’s offered drivers more consistent earnings and insurance protections. Lyft says drivers earn $20 an hour on average, while most use the app to supplement their existing jobs. It marks another spell of negative publicity for Uber, just as the company gets ready to list its shares on the New York Stock Exchange