If an individual trains a model on their own data to embody their own skills and behaviour, so that they can then sell/rent that model out to work on their behalf, well in that scenario not being able to treat the weights as intellectual property (copyright or otherwise controllable by a license), would be a huge violation and detrimental to that individual.

I think it would be a shame to try to build legislation around the notion of the sass melting pot application of machine learning and in the process destroy all sorts of other use cases.