openSUSE Tumbleweed and SUSE Linux Enterprise Server also run on IBM Z mainframes. I don't see how "Red Hat" has revived mainframes, they are not doing anything

openSUSE Tumbleweed and SUSE Linux Enterprise Server also run on IBM Z mainframes. I don't see how "Red Hat" has revived mainframes, they are not doing anything SUSE, openSUSE, Debian and many others are already doing.