I have no reason to doubt the benevolence of AWS at present, but how much faith do you have in the perpetuity of that benevolence? There is a tremendous power imbalance between Amazon/Google/Microsoft and the companies that depend on them for infrastructure, and the nature of capitalism and the declining rate of profitability means that eventually, the markets will demand for that power imbalance to be exploited economically.
When the Manorial system emerged in Europe, it was a largely benevolent force offering stability, security, and community in the wake of the collapsing Western Roman Empire - within a few generations it morphed into 1000 years of serfdom.