Congress passed the Arms Export Control Act (22 USC 2778) in the Ford administration and it has been applied to software since at least the Clinton administration.
(edit: not that these models are equivalent to missiles oc)
It's pretty problematic to not make it more widely available at least to US businesses, and there is not even a vetting process to get approved quickly and easily. If this is the new norm, the intended or unintended consequences of this type of gatekeeping will be an unprecedented consolidation of power amongst the largest corporations. Even more than we have seen over the last 20 years.