Consider the difference between a race and a boxing match. They're both sports but if you sign up for one and find yourself involved in the other you'd be unhappy. In law this sort of things is referred to as 'tortious interference'; Uber isn't running their own business here, but trying to fuck up Lyft's If they want to play that game, then why shouldn't Lyft send spies to their offices and attempt o steal Uber's corporate info? This sort of no-holds-barred capitalism has been tried before and people didn't like it.