It's expensive to store, and it may not be worth building the storage facilities if you only get to use them once. So the market is not perfectly efficient here.
But yes, this argument explains why the "running out of helium" narrative is overblown.
The market has vehicles for this, e.g. purchasing rights to the helium while leaving it underground. Perhaps that's not what the law allows for, however.
But yes, this argument explains why the "running out of helium" narrative is overblown.