Red Hat main business is services, support, training, not software by itself. In the end, their product is their people. That a lot of business uses CentOS just

Red Hat main business is services, support, training, not software by itself. In the end, their product is their people. That a lot of business uses CentOS just grows his potential market And, btw, one of the factors of Microsoft dominance is copying their software too (along with forcing hardware vendors to include it by default, of course)