Why should any exist yet, when natural gas has been so cheap? Tighten the screws enough to eliminate fossil fuel dispatchable sources and you'll start to see it (or something else that can solve the same problem better).
I agree, we should tighten screws to eliminate fossil fuels. But hydroelectricity is the only scalable form of grid storage we currently have, and that's limited to the right geography. Expecting some unproven technology to be a silver bullet for storage is extremely wishful thinking. We need to be honest about technologies like hydrogen, compressed air, flywheels, etc: These are experimental technologies that might operate cheaply at scale, but we have no real-world experience to back up these claims. I could just say "storage is irrelevant because fusion will deliver energy at $1/MWh" and while nobody can technically disprove it, since they can't see into the future, it's also dishonest to claim this as fact for the same reason.
The reality is that hydrogen storage costs nowhere near $1/KWh. People making predictions about what a technology will cost and actually building it are two totally different things.
Can you point me to a developer that's actually offering to build hydrogen electric grid storage at $1/KWh? As in, if I give them $1 million they will build 1 GWh of hydrogen electric storage for me. Are there any enterprises actually willing to provide grid storage at this cost? If so, please point them my way. I'll make a massive amount of money. But I doubt I'll have anyone taking this offer.
The storage costs your citing are absolutely incredible. As in, I genuinely do not believe them. You're claiming that the entirety of the US's grid storage (which cost billions of dollars to build, mostly in the form of hydroelectric storage) can be matched by only $20 million in hydrogen storage. This is a cost estimate totally disconnected from reality. Until enterprises are actually building hydrogen electric grid storage for $1/KWh then this figure is meaningless.
If not then what's your explanation as to why people are missing out on the opportunity to become billionaires or trillionaires by construction hydrogen electric storage? Bill Gates alone could build enough storage for 24 hours of the USA's electricity consumption with only 10% of his net worth. This would be a rounding error on the national budget.