I've seen it being done even on internal projects though. Things within an organization.
It tends to be that they start developing a feature and then someone comes along and says, ooh wouldn't it be nice if it did x, so they modify it to have x feature. Then someone decides it should be able to sync with Azure (there's always someone that wants that), so Azure sync is added, but now that interferes with x, so that has to be modified so that it can sync as well. Then we get back to original product development which is now 3 weeks behind schedule.
Repeat that enough times and you can see why a lot of this stuff fails.