Will it also be "arson" if OpenAI dump on us solutions to more practical problems, for example, a blueprint for a better photolithography machine, or a nuclear power plant?
No that would be irony. Use up all the chip foundries and power plants to make more plans for chip foundries and power plants so we can build more chip foundries and power plants and use them to run AI to design more chip foundries and power plants.
How is that irony? This is literally how life works: eat to gain energy, expend it to forage/hunt/farm/toil so you get more food, eat it, hopefully get enough of a surplus to raise kids who will do the same. Everything in life is built on top of this basic gameplay loop.
I see why you might call it sisyphean, but I don't see what's ironic about it.
To witness an arson and rejoice reveals an ugly kind of sadism.