Alma Linux is done by CloudLinux, and still uses their infrastructure, secure boot certificate, etc (according to their page at https://web.archive.org/web/20221208102246/https://wiki.alma...). They have never had anything to do with CentOS.
Rocky Linux _is_ community oriented, and _is not_ beholden to a specific company, but it is not necessarily unpaid. The majority of the most active contributors to the project are being paid by their respective organizations (CIQ, OpenLogic / Perforce, etc) to do so.