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Because eff the deep ocean and whatever lives there, right?

I think the idea is that the acidity gets neutralized by the calcium carbonate deposits on the sea floor.

Which, of course, is some kind of undiscovered kraken kaiju monster. :)

Or a ton of small organism that will die because last time ocean was that acidic down there was a billion years ago or sth.

And they'll decompose producing methane, raise to the surface and put climate change into overdrive.

Which would be worse than kaiju. :)

You don't seem to realize just how much water there is down there. They will not even notice a century's worth of surface carbon, but might welcome the infusion of oxygen that comes with it.

Surface production of H2 feedstocks will produce a huge surplus of oxygen, so we won't miss it.

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