Unprotected and uninsured, they’re quickly becoming second-class citizens — O n Sand Hill Road, startups can pitch themselves as the Uber of X, and investors will throw fistfuls of cash at them. “Let’s Uberize the entire economy,” cries a Forbes article. Soothe, an on-demand massage service, raised $31 million this past May. Wag, a dog walking service, raised a…