Perhaps for ethical reasons but a stated reason by Anthrophic is technical. "But today, frontier AI systems are simply not reliable enough to power fully autonomous weapons."

With the other stated reason being legal. "To the extent that such surveillance is currently legal, this is only because the law has not yet caught up with the rapidly growing capabilities of AI."

I don't think we should lessen Anthrophic's stance from technical/legal to ethical. Just as we shouldn't describe what the department of war is doing as "not renewing a contract".