This looks like seeing the Iranian demands to be paid for transit, and saying "Nice business model; let's steal it".

But there's a larger point here. Iran has been using the ability to close the Strait as leverage. "We can deny the transit of oil, so you have to not trample on our interests." Well, the US also has the capability to close the Strait, and therefore the same leverage - including that leverage over Iranian oil.

And by Trump saying this, he's pointing that out. Pointing it out in a way the Iranians should understand, because it's the same language that they used.

I don't know if Trump is deliberately doing that, or just doing an extortion threat.

In case you didn't know, the US had already been blockading the Iranian Gulf before the "deal" (surrender) that lifted sanctions on Iran.

What about showing the U.S. had the capacity to close the strait, requires charging a toll?