I really find that assertion hard to believe. AWS is notoriously expensive and oddly enough its added value comes in the form of proprietary technologies which require non-transferable tech skills. The lock-in overload goes to the extreme of leading technicians to specialize exclusively in AWS services which leads to the infamous title of AWS engineer. This doesn't happen by chance, but by design. It's like a very expensive mousetrap designed to help victims get in but being practically very hard if not impossible to get out.