Great points being made. Many things don't make sense in Argentina. Many things are ass backwards. But it is what it is and the best thing you can do is follow the laws when it comes to dealing with 100% cash closings. As
@Vince mentioned, there are very strict money laundering laws here. The problem with cuevas or using crypto and just cashing out is you are by-passing certain security checks to make sure you aren't some drug dealer or arms dealer. So it's not just a matter of having cash or crypto. There is a reason they are so strict too.
Presidents come and go as Vince mentioned. I have mentioned this fact many times over the past 2 decades doing business in Argentina. There have been many times and occasions I have seen when someone is selling a property, for them to see how the funds were brought into Argentina and if it was legal or not. There isn't really any shades of grey on this point. It is very easy for the government to see when you sell and ask how you brought funds into Argentina.
Sure, this doesn't happen all the time but it DOES happen. It is kind of comical that people would never dream of breaking some law in their home country but in a foreign country where they don't understand all the risks and possible bad outcomes for them to just not understand the laws in place. People are in a rush to just buy without fully understanding the process. Or a realtor will tell them to just wire in black and tell them it's ok and no one cares. Typically just so they can make their commission.
No matter how many times I say this, people don't understand that things are totally different here. Laws are different, process is different and system is different. If you choose to go ahead and do something illegally you should at least understand the possible ramifications. The currency controls can't end soon enough. But until they do, it would be wise to at least understand the laws.
There ARE legal ways to get USD cash into Argentina and typically those legal ways won't cost you more than the illegal ways. They typically cost the same amount of %. Many people that are choosing to do the illegal way typically have something to hide. In all my experiences in Argentina, it's much better to do things the right way.