To give more background, it supports Podman[1], which behaves the same as Docker in many ways. But the support situation changed with Fedora 31 because of CgroupsV2[2]; however, that doesn't mean Docker CE _won't_ ever run on Fedora 31. Follow this GitHub issue[3] for progress

[1] https://podman.io

[2] https://fedoraproject.org/wiki/Changes/CGroupsV2

[3] https://github.com/docker/for-linux/issues/665