It may not be fair price wise but it could be justified for environmental reasons.
Where do you think the money would come from for a $3 per kg subsidy anyway ? Would that be any fairer ?
PLUG will need to transport another way or produce onsite to support their electrolizers, while other companies electrolizers can work on natural gas and I assume blended gas.
Or some company can get brownie points or a environmental credit for buying the hydrogen that is blended.
When a company puts oil or natural gas into a pipeline do they always get their own out of the other end ? I don't think so.