Don’t use Fedora or it’s ilk for starters.

Fedora doesn’t make Red Hat any money anyway. That’s like saying to not use Debian because that could help Canonical’s Snap vehicle Ubuntu. For now Fedora is mostly unaffected by Red Hat’s weird moves. As a long time openSUSE user myself, I’m somewhat experienced in using a community distribution sponsored by a company that got worse and worse over the years and I definitively would not want to buy SUSE Linux Enterprise ever. Weirdly enough, openSUSE even got better as a consequence of some of SUSE’s moves. Fewer employed upstream contributors led to the very automated QA and release processes of Tumbleweed, the rolling release distribution. If you have read about problems within openSUSE because of SUSE, it’s about Leap, the LTS variant practically nobody uses because TW is just so stable and good. If Red Hat or SUSE ever go totally mad and torpedoed Fedora / openSUSE, both projects have enough safeguards in place to move the projects into independence with little interruption.