BitTorrent cofounder and president Ashwin Navin is leaving the company . He has plans for a startup incubator in San Francisco's Mission District. Good! That means he'll be screwing up far less consequential companies from here on out. Navin deserves credit for persuading Bram Cohen, the creator of the BitTorrent file-sharing protocol, for building a company around it. But that's about it.Navin wasted years and millions of dollars trying to turn BitTorrent Inc. into a competitor to Apple's iTunes store. He struck splashy deals with Hollywood studios by paying them large upfront guarantees, which depleted BitTorrent's bank account but got Navin into the right parties. Meanwhile, BitTorrent's other line of business, which used file-sharing technologies to deliver content more efficiently for corporate customers, suffered from lack of focus, and more established competitors like Akamai moved in. Sometimes losing a founder is bad for a company. In this case, it's nothing but good.