Assuming all of the pitch is for making fabs, which nobody actually knows. This is all speculation. That’s all this is, since nobody has presented any facts about the proposal other than the dollar amount.
Fabs use a lot of energy, so you need to install a lot of power generation capability. Processing also uses water, which means installing infrastructure for that. You can build your own cities for workers, so it’s possible you’d be building that, too. We don’t know how comprehensive it was.
The basic knee-jerk analysis, that $7T for chip plants is preposterous, should lead to at least the possibility that there’s more to the proposal. The idea that you can only come to this one conclusion is idiotic, and just tiresome manufactured outrage. An exercise in bad-faith discussion.