Not for nothing but they didn't release it. It's under US supervision and can only be used for humanitarian aid. It has not been tapped and they recently put a hold on it again
The $6 billion in Iranian oil revenue was freed up last month as part of the U.S.-Iranian prisoner swap in which five American citizens were freed. It was made available solely for humanitarian purposes and is under strict U.S. oversight.
The White House on Thursday repeatedly stressed that Iran has not yet tapped this humanitarian fund
So this is all basically noise
If it was actually just noise, the administration wouldn't have reversed course. This was an actual policy decision that was made by actual flesh-and-blood people. Those folks have since realized that this was a mistake, and they've learned from it. We should learn from it too.
(In case somebody needs this to be said out loud, the lesson is "Iran gets its assets frozen for a reason.")
Also, sorry to put it this way but I don't have any other choice. "This money can only be used for humanitarian purposes" is a bad argument made by naive people who don't understand how budgets work. When somebody makes an argument like this, you should go back and lower your estimation of every argument that person has ever made. Seriously. They're not going to be wrong about literally everything, but they are thinking about the world using a fundamentally broken model of how organizations operate. For example, I am working under a very strict rule that says that I cannot spend state funds on alcohol. Later tonight, I will be attending an on-campus event with faculty and friends of the university at which wine will be served. Breaking the law? No, we have another pot of money we can use for stuff like this. Just because one pot of money is highly-restricted doesn't mean that all pots of money are similarly restricted. Give people a special fund labeled "Humanitarian Purposes Only" and they'll just cut their food and medicine budgets and transfer those funds to the terror budget to compensate.