[1/2] WeWork logos are seen at a WeWork office in San Francisco, California, U.S. September 30, 2019. REUTERS/Kate Munsch/File Photo
Aug 11 (Reuters) - WeWork, a prized startup just four years ago but now a micro-cap, and other penny stocks such as Amyris and Proterra are the latest focus of speculative bets from retail traders, with shares of the financially struggling firms…