Again, common ground between #AI and #NuclearEnergy shows up.
The immense costs with a limited result don't allow for more than a mediocre efficacy. That is against basic capitalistic rules, which tries to optimize efficacy.
At the moment, a lot of the costs are hidden. And I am not even talking about waste management in a couple of decades.
Nope. These technologies have one single reason to exist:
THEY ARE THERE FOR MILITARY USE.
Costs are irrelevant, if you want to build a nuclear bomb.