Millions of dollars in backing from seasoned venture funds and investors. Technology built to improve efficiencies and lower costs. And plenty of ambition. What does this combination add up to? In one recent case, it added up to a home care company that announced last week it was closing its doors for good. California-based HomeHero ceased its home care operations after just a few years in business and raising $23 million in venture-backed investments. HomeHero is one company