Even worse, the powers that be can deny a transaction.
Think about that.
"They" can tell you what you are permitted to purchase. Anything you can think of that the elite would be uncomfortable with you purchasing?
You are not wearing a tinfoil hat. You are predicting the future.
They are already do that. Several banks are no longer offering credit to anyone in the firearms industry. I think it was Visa that tried to stop their cards from being used by or at an FFL (that fell through). Just one of the many steps they are trying to bring about disarmament.