Carbo - WRONG !
No one wanted to serve an out of the way research center with a tiny amount of Hydrogen (It's not worth the effort!), so Plug won by default.
And since Plug has to buy most of their liquid hydrogen from Air Products (NASA's primary hydrogen supplier) , so , AP won't be supplying any hydrogen to Plug for any real / high margin NASA facilities.
By not building any more hydrogen production capacity, Plug has just become a minor hydrogen jobber/reseller and little more.
Do you know why there is a Nasa facility in Ohio ? Ever heard of Senator John Glenn ?