As far as I can tell @cwrainey, the purpose is to lock future users into the same licensing as your original product. So someone can't swoop in, add one ingredient, and then make it proprietary. It forces the user of the license to both attribute the source:
"You must give appropriate credit, provide a link to the license, and indicate if changes were made. You may do so in any reasonable manner, but not in any way that suggests the licensor endorses you or your use."
And adopt the same licensing of any future formulation:
"If you remix, transform, or build upon the material, you must distribute your contributions under the same license as the original."