Correct me if I'm wrong, I'm still on the learning path of Linux. But there doesn't seem to many forks of OpenSuse? There are a bunch of forks of Arch, Fedora and Debian, but why not OpenSuse? Is it a license problem or something else?
SUSE Linux Enterprise isn't really a fork. OpenSuse Leap is to SLE a bit like Fedora is to Red Hat i.e. the community version which is then frozen at some point to build SLE.
SLE is a fork of factory. Leap is based on SLES with community additions, it's why SUSE changing to ALP and dropping desktop support in the new version was such a big thing for the future of Leap.