They own things like:

1. Red Hat Enterprise Linux, which is by far the most commonly deployed Linux variant among US Enterprise orgs.

2. Ansible

3. Podman

4. Hashicorp Terraform / Consul / Packer / Vagrant / Nomad / Etc.

5. Giant B2B services arm

6. Mainframe, which a lot of science organizations / governments / credit card companies still run. Sometimes you may have an IBM rep show up to replace a part on the mainframe you didn't even know was broken - very reliable, fault tolerant system.

7. The only service I know where you can rent Quantum computing time in the cloud

8. Probably a ton of other things I'm not even aware of.

9. Red Hat OpenShift - so if you're big enterprise running k8s on prem, there's a good chance it's OpenShift, especially in banking / finance / government.