usually the definition is around some technology coming out that the incumbents were so heavily invested in earlier technology that they couldn't embrace the new technology until it was too late. It's not that taxis companies couldn't have developed tech, it's because they followed the law which caused them not to be able compete. so, unless you call "law" a technology I don't include it in my definition. And since most of the other on demand companies are failing it leads me to believe it's not about technology or even strategy(unless you call breaking the law a strategy). Is my way the only way to look at it obviously not. Just like facebook didn't disrupt anything. they just executed better.