The Boston-based lawyer suing Uber over use of freelance workforce is casting a wider net

The Boston-based lawyer suing Uber and Lyft, seeking to force the on-demand app companies to classify their drivers as full-time employees, has filed similar complaints against Shyp, Washio and Postmates this week in San Francisco. Shannon Liss-Riordan, a lawyer with suits pending against Uber and Lyft in the Northern District Court of California, had also filed an earlier complaint against food-delivery startup Caviar. San Francisco is ground zero for these labor cases against on-demand companies…