They used to dominate mainframe computing. They still do. Its just that the tech industry has become much much bigger than it used to be. PCs, internet, Mobile

They used to dominate mainframe computing. They still do. Its just that the tech industry has become much much bigger than it used to be. PCs, internet, Mobile etc etc. You surely don't expect a single tech company to dominate the entire tech industry. It requires way too many competencies to make it work.