Short term: Amazon pays licensing fees to RedHat to keep the product going, if necessary. I don't know if they're at that stage yet, and big companies can have whatever arrangements they would like between them behind the curtains.
Long term: Amazon develops a new Distro unbeholden to RedHat/IBM. Only a matter of time.
Long term: Amazon develops a new Distro unbeholden to RedHat/IBM. Only a matter of time.