-I would guess (mind, guess, I don't know the first thing about gas drilling) that as they needed to take great care retrieving the core samples slowly to allow the hydrogen to evaporate without damaging the sample (as per @abcd_f's comment above), the rate of hydrogen release from the rocks is simply too low for it to make any sense to drill for it.
After all, if hydrogen is slow to escape from the core sample, it stands to reason it will be slow to escape from the surrounding rock, too.
(Given a bit of electricity, we can easily get lots and lots of hydrogen from water, anyway.)
After all, if hydrogen is slow to escape from the core sample, it stands to reason it will be slow to escape from the surrounding rock, too.
(Given a bit of electricity, we can easily get lots and lots of hydrogen from water, anyway.)