Can these containers be run hosts that are not RHEL? It seems like it's allowed, but I'm not completely sure I read that right.

I'm also looking to know what packages are available in RHEL8 that are not available to UBI containers. I'm not able to find information as to what subset of the RHEL package universe is available to UBI containers. If you're aware of information on this I'd love to be pointed to it.