Comment by n4te

Anyone can distribute the Spine Runtimes without a Spine license, but they have to attach the Spine Runtimes license, which means the need for a Spine license is pushed down the line to their users. In this way someone without a Spine license can use the Spine Runtimes in game toolkits/etc without having a license themselves. https://esotericsoftware.com/spine-runtimes-license