[null and void]

Yet there is still plenty of hydrogen in the sulfuric acid atmosphere? H₂SO₄?

Go figure!

Off on a long trip, BBL

[Moonman62]

Sulfuric acid is made from other trace compounds and elements in the atmosphere. There isn't much of it.

Sulfuric acid is produced in the upper atmosphere by the sun's photochemical action on carbon dioxide, sulfur dioxide, and water vapour. Ultraviolet photons of wavelengths less than 169 nm can photodissociate carbon dioxide into carbon monoxide and atomic oxygen. Atomic oxygen is highly reactive; when it reacts with sulfur dioxide, a trace component of the Venusian atmosphere, the result is sulfur trioxide, which can combine with water vapour, another trace component of Venus's atmosphere, to yield sulfuric acid.

And the atmosphere is still losing water from what little it has.