Why is Iran getting any money out of this ?

How do they still have any cards ?

They have had cards since they demonstrated, in mid March, that they would blockade the Strait, could destroy the Kuwaiti oil economy with very cheap drones, and were prepared to do the same to more US allies.

The USA functionally lost this war on the 20th of March when the threat to Kuwait was demonstrated. Everything that has happened since was just delaying the inevitable. It was a mistake.