I don't think we should be applying the same standards to AI, which will be the most important technology in all of history. The way it proliferates is going to make a large impact on humanity's future.

Of course, DeepMind is perfectly within their legal rights to not share their models. But ethically speaking, they should... or maybe they should be trying to keep AI out of the hands of the public at all costs. Either way, this is too important to rely on copyright laws for answers.