Right, but your example presumes tpdays facebook market. Im presuming todays market where people are feeding all their ideas to a third party, much like how open source software is pilfered and turned into business ventures.
Now even if you want your idea to compete with all the other todo apps with your special sauce, youre giving a third party your recipe. That third party ostensibly has no reason to steal it, their business model does.
So, sure, if your app is a cult of personality and nothing special, i admit it doesnt matter.
But the number of software home runs is dwarfed by all other auccess on individual products