I would think AWS pays a lot in licensing. Oracle database, Oracle MySql, Microsoft Sql Server Microsoft Windows. But microscopic compared to having to run pro

I would think AWS pays a lot in licensing. Oracle database, Oracle MySql, Microsoft Sql Server Microsoft Windows. But microscopic compared to having to run proprietary software on all servers. System administration over hundreds of thousands of servers is a lot more complicated than one or a few z15 or Linux One machines. In addition, z15 has battle-hardened reliability (far above AWS servers). All the infrastructure to feed and care for over hundreds of thousands of servers is a lot more complicated. Even if what you have to do is just shutdown servers that are not working and never turn them on again. It is one of the biggest advantages of the z15 platform.