I guess if the new model has the capability to do 'something' that's national security threat, then this makes sense. Otherwise this move makes zero sense, and actually is a drag on innovation - who wants to invest money and people to make a better model that can't actually be sufficiently sold to make a return on investment? Meanwhile other models from Europe or China that are better steal market share. Though that's not to say they won't do the same thing for the same reasons.

> Are we heading to a world where GPU use is regulated

Well, there was the kerfuffle around PS3 (IIRC) and 'supercomputers'. I suppose that would be the 2020s version of that. What's old is new again. Ultimately you can just continually wire together less powerful hardware to come up with something that can do the job.