Moraes have a case in his hand (the tried coup last year), because he was the supreeme judge for the elections. He judged that these people tried to help the coup and demanded that their accounts are suspended (entirely cool with the constitution), as musk doesn’t want that, they’re gone from Brazil and might be blocked countrywide.
I don’t think Milei will make Argentina better in any sense in the short/mid/long term. Bolsonaro, Trump, everyone on the far-right says the same thing but it only gets worse, never better.