For large corporations and gov organisations I can see how that could plausibly be true... for everything else, not so much. At smaller companies the hierarchy is not so rigid or deep, and people are not so siloed, they must work together more closely and feel each others pain.

I'm a dev at a such a small company, and in a position that I can make or highly influence such decisions. Oracle products will never be in our supply chain because of me - a dev.