> Pure hydrogen is not found in meaningful quantities on earth.

This is not necessarily true. A recent discovery in France could contain as much as 250 million metric tons of hydrogen (but that's a generous upper bound).

Sure there’s useful amounts of grey hydrogen but not enough for any kind of energy transition.

We’re talking about the useful energy from ~1 number power plant over its lifespan. So find ~1,000 such locations and that would be a big deal.

This is white hydrogen, not grey hydrogen.

It's not clear what would be available globally if it were looked for as it was in France.

Ahh ops flipped though there’s a really long list: https://en.wikipedia.org/wiki/Hydrogen_production