It certainly seems to be a laundering enabler. Say that you want to un-GPL-ify some famous copylefted code that is on the training database. You type a first innocuous characters of it, then the co-pilot keeps completing the rest of the same exact code, for it offers a perfect match. If the completion is not exact, you "twiddle" it a bit until it becomes. Bang! you have a non-gpl copy of the program! Moreover, it is…
You'd just have to wrap it in a nice complex model representation so it's a black box you fed example OS's with some meta-data into and it happens to output this very useful data.
After all, once you use something as input to a machine learning model apparently the license disappears. Sweet.