So, we’ve just handed GAMI a monopoly on our fuel supply.
GAMI owns a patent on its G100UL fuel. The purpose of a patent is to grant a monopoly for a limited time to the inventor of a useful innovation.
So yes, GAMI has a monopoly on G100UL. That is not a problem. GAMI will not be the only producer of G100UL, because they are NOT a fuel producer. GAMI licenses fuel producers to manufacture G100UL. There is no reason for there to be only one producer of G100UL. It’s likely that most of the companies currently producing 100LL will become producers of G100UL.
The patent simply ensures that GAMI can get paid for its work of inventing the fuel.
The reason there is only one TEL supplier has nothing to do with patents or monopolies or ASTM. It’s because the market for TEL is very small, and no one else considers the expense of starting TEL production to be worth the reward.
ASTM does not do what you think it does.