I've never implemented Dropbox in an app, so I don't know. But what you don't know is that the people who message AgileBits on their website are even customers in the first place. And even if they are, which I'll concede because I don't care, there were a handful of them. Presumably this is a handful out of thousands? Millions? If it mattered to more people, more people would complain. That was my point.

They addressed the ease of implementation, and have a valid point - it breaks backwards compatibility. That is something I do know about, and it's a terrible thing to do. Yes, they could write a migration path. Yes, they could write all the documentation in the world to go with the migration path. But, yes, it will cause their existing customers - who aren't complaining, save a handful - pain, since the app will stop working as expected, even if only briefly. And that still doesn't address the fact that AgileBits gets to make the app they want to make, and we have the choice to use it or not.

The ease of implementation was never their rationale not to, and even was acknowledged in the thread. And my primary point was that they're only accountable to users as far as they can keep them, and have the freedom to make the application they want.