Rolling release images are free to download for everyone. Long term support images follow a Red Hat-like “pay for binaries” model, though they are available for active contributors to the project for free as well.
Ready to use long term support release images are only available to customers who purchased a subscription and to community members who are contributing code, testing or documentation to the project.
Everyone can build an LTS release image from the stable branch too. For 1.2.x, the branch is named “crux”. The image built from the branch is equivalent to the latest official LTS image.