What kind of non-agile bottom-up software projects have you experienced? Bottom-up waterfall? I guess it's possible in theory but that would be a sight to behold.

My only point is that in most situations, upper management are fools that should be left to their devices and should never get a say in development methodologies. By definition if upper management imposes Scrum, it's a self-defeating prophecy.

Your average tech company should be somewhere in the bottom-right, but bad managers are trying to pull the needle upwards to justify their existence or make up for their incompetence. But they still call that "Agile" (which can be true by some definitions of the word) or "Scrum" (which that isn't, by definition).