I think you're misunderstanding what I mean by immediate noticeable harm. Running pipelines next to rivers has the potential to cause an oil spill, so the harm

I think you're misunderstanding what I mean by immediate noticeable harm. Running pipelines next to rivers has the potential to cause an oil spill, so the harm is not immediate. There's still room for people to convince themselves that they'll make the pipeline safe and reliable. But the mass of the Moon is so high, that mining and shipping off significant portions of it has to be very deliberate and there's no question of 'potential' in causing a shift in the Earth's orbit. For context, at the rate at which we mine metals on Earth, it'd take tens to hundreds of millions of years to mine even 0.1% of the Moon, and that's without considering that all that mass would have to be transported elsewhere for it to be a problem (and since other destinations, mostly by definition, have their own easier to access resources, that seems unnecessary). Mining all that material on human timescales would be a very deliberate operation dwarfing all human mining from the start of civilization.