"We" do not as you can not control 8 billion people

it's certainly not that difficult to imagine international controls on fab/DC construction, enforced by the UN security council

there's even a previous example of controls of this sort at the nation state level: those for nuclear enrichment

(the cost to perform uranium enrichment is now less than building a state of the art fab...!)

as a nation state (not facebook): you're entitled to enrich, but only under the watchful eye of the IAEA

and if you violate, then the US tends to bunker-bust you

this paper has some ideas on how it might work: https://cdn.governance.ai/International_Governance_of_Civili...