Maybe the author should consider a more explicit proprietary for liability purposes and clarity about revocability, exclusivity, transferability, et al, but for now any user should assume he can choose to do whatever tomorrow and proceed with caution.
Wonder Unit even has developers sign a CLA agreement assigning all contributions to Wonder Unit (https://cla-assistant.io/wonderunit/storyboarder)
Maybe the author should consider a more explicit proprietary for liability purposes and clarity about revocability, exclusivity, transferability, et al, but for now any user should assume he can choose to do whatever tomorrow and proceed with caution.