No, it is not legal in this country.
The State gives the money from tax to spend in the campaign.
What are the criteria for getting money from the government for a campaign? What are the laws and oversight to ensure that all potential candidates get the same treatment?
As far as I understand things, don't you have to get something like 6,000 signatures of voting individuals to start a political party? Is there a different number required for a political party to field a presidential candidate?
Once a political party has met the requirements to field a presidential candidate, does the government give money equally to all parties?
Can each party raise money among its membership to determine what candidate they will field? Or do they get this from the government as well?
Is it illegal for people to raise money for a candidate's cause and let a group spend the money as they see fit as long as the candidate themselves are not involved? For example, Citizen X wants to spend his own money to buy TV ads to tell everyone what a great guy he thinks Macri is. citizen Y and Z want to do the same thing, but realize that if the three of them pool their money, they can coordinate what they want to say. Maybe Macri's fund-raiser is about getting money to a citizen organization that will spend money saying what a good person he is.
Seems strange to me to not allow private funding of campaigns. I can understand wanting to put contribution limits, candidate spending limits, or limits as to who can contribute (for example, foreign contributions would seem a good place to start limiting contributions) but if the government is responsible for funding presidential campaigns, what's to stop the government from giving advantages to those they like and causing hardships for those they don't?
With private contributions, the people are speaking as to whom they like for candidates. Even a grass-roots candidate without big money backing them can raise a significant amount of money from just poor people (particularly in this country where there are a lot of poor people). Maybe spending limits would help candidates with less "big money" backers.
And how is any of this (particular an alleged fundraiser for Macri) different than the videos we've seen where FpV buys votes from poor people by giving them food and money in exchange for a promise to vote for them, where the organizers who interact with the population instruct the voters to fold their tickets in a certain manner so the pollsters know who brought in the vote and get the payments out to the organizers correctly?
People put way too much trust in the government here, even after it screws them time and time again. And I'm not picking on any one party when I say that, either. In fact, I believe that is certainly the case in most countries, the US included.