I don't think drawing up quarantine rules that cut out part of an opponent's squad is on
I think you're taking it as though these rules targeted argentina for a competitive advantage.
Brazil's government has been a trainwreck for at least a decade. They put england on their redlist as a tit for tat kind of thing because England rightfully put them on it because covid has been out of control there.
I'm also pretty sure those players left against the clubs will. The club doesn't have to release them but cannot actually physically stop them from going. The players also didn't disclose that living in England part... wonder why?
The Brazil health ministry definitely over stepped and took a power grab from my understanding the federal govt, Brazil and Argentina's FA's reportedly reached an agreement where the 4 English based players wouldn't play or be on the sidelines. They'd stay in the lockerroom.
Somewhere things went sideways, because I don't believe argentina was gonna live up to their side of the deal and we all saw what the health ministry was hell bent on doing.
This wasn't for a competitive advantage, and even though Brazil has a great football/sport culture, they've been getting some flack from citizens for the government money poured into these things for the World Cup and Olympics.
I think the health ministry/ some in the government were probably weary of this and weren't going to allow for 2 sets of rules, one for footballers and one for everyone else. Or at least allow that perception to exist - that's all just my 2 cents, speculation based on nothing but what I know from a far.
I personally think the best solution is you tell the two FA's get your bleep together, you set a date during one of these windows already established, or no one gets any points. Seems like the fairest thing to do in my opinion. Both FA's are at fault to an extent in my opinion.