As far as I know, that is his nickname, not given to him by the media or by someone who hates him for his ideas. There is no doubt that he has very drastic ideas, but I also personally do not think that he can change his country with them, especially if it is publicly known from which country he is asking for help, and which was the first one he visited after becoming president (US).
President-elect Javier Milei, known by the nickname “El Loco” since he was a kid, rose from university professor to social-media celebrity, making his mark as an economic libertarian and social libertine.
No Lucius, please no
Msn? really?
Microsoft News?
Why do crypto people choose mainstream?
Do you think the elites love you?
El loco - The madman - is used by his enemies in order to defame him.
Nobody among his supporters call him that demeaning way.
So using that nickname you side with mainstream media - those who defame him.
There you go Lucius
It took me 2 minutes, and no, I won't translate it for you

President-elect Javier Milei, known by the nickname “El Loco” since he was a kid, rose from university professor to social-media celebrity, making his mark as an economic libertarian and social libertine.
"A social libertine" - "A libertine is a person devoid of most moral principles, a sense of responsibility, or sexual restraints, who sees these traits as unnecessary or undesirable"
Lucius, when you read that expression, didn't come up to you "Well maybe these people aren't 100% objective..."
Crypto people informing themselves about pro-BTC personalities from news organisations - mainstream media - that hate and openly defame them.
And then they wonder why the crypto community has betrayed Bitcoin's ideal
Considering the economic situation in that country, people simply like the change that has taken place, but it remains to be seen what the president will do during his mandate. As far as I know, his party does not have a majority and I don't know if he will be able to implement all the changes he wants, but time will tell if there will be positive changes or not.
Time will tell?
Time doesn't tell anything Lucius, it's us who need to search for infos.
It took me 5 minutes

............................................

That's why Argentinians love him.
Wait for Msn & Facebook to inform you about these achievements.
but I also personally do not think that he can change his country with them
No need to think Lucius, just say goodbye to Msn and Facebook, go to X and do a 5 minutes search.
The Milei administration is fixing the state budget, so Argentina's risk rating is decreasing.
That means their credit rating is increasing - and no, I'm not going to explain the benefits for the country of a credit rating upgrade.

There were some stories that "El Loco" is somewhat pro-BTC, but this is the first time I read that something concrete is happening in that direction
Some stories?
They are not "stories", they are facts. The proposal to de-tax cryptos is not a "story", is a fact.
Milei is the most prominent pro BTC political figure worldwide.
How is it possible that crypto people don't know how pro BTC is the president of a major country?
Oh yes, Msn and Facebook...
It took me 60 seconds
put "Milei" and "Bitcoin" in Seach and scroll down.
Bitcoin Magazine, V. Buterin was one of their founders.
