Well, now that we know that Manuel is quitting his contribution to the addon’s development, it is time to gather a team of people to continue where he left off.
Exceptions were made to models produced by the official version of the lab that allowed them to be used in a variety of applications.
However if you were to make a derivative product or expand on the lab, the viral license would spread to anything created with it.
This renders any derivative of lab created by other users unusable for most purposes, even for research purposes, unless the entire work product or at least the portions of the work product related to using the characters created are open source.
Alternatively, an interface can be developed that can inoculate the proprietary portion of a codebase from viral assets, but for most projects using skeletal meshes it is difficult to create such an interface.
The solution to this might be if Manuel changed the licensing so that end products created with derivatives of lab can also be licensed under creative commons or otherwise changed lab to a more permissive license.