Parasite (2019) is a Korean movie which got international success and was rated highly due to sharp social commentary on class inequality with a thrilling, genre-bending plot combined together, but the dynamic of the movie is expressed from a SK point of view about economic pressures and modern class divides.

There are also cultural contexts to keep in mind that won't translate into American culture such as:

• Banjiha housing: The Kim family reside in a semi-basement apartment, which is a distinct urban housing type in Seoul born from historical 1970s civil defense laws.
• Jjapaguri: The upper-class Mrs. Park orders jjapaguri (a mix of two instant noodles, Chapagetti and Neoguri) topped with expensive Korean beef Hanwoo, a specific local comfort food combo.
• National health exams: There are specific plot points relying on South Korea's public health system and annual medical checkup schedules.
• Suseok: The gift of a decorative viewing stone satirizes traditional Korean middle-class aspirations for wealth and prestige.

Even if they could recreate an English-language remake of Parasite, would there have to be adjustments in order to suit American subculture? As in, Suseok isn't a thing in America and Westerners don't eat Jjapaguri, so they may replace that with something entirely different or swap Jjapaguri for another noodle dish or pasta.

Will a US remake really carry the same impact as the original if it were to be created? Would it be good or turn out terrible as it’s hard to capture what makes the original special for audiences?

There's a difference between:

• The Federal Government spying on people & detaining dissidents
• Palantir conducting espionage & harvesting data from everybody

The first one is more by the government in which they have legislative power to enforce rules on the population (which is something Palantir does not possess) also giving power to both LE and the judiciary on detaining people. Usually, it's a politician who creates these laws for their own gain. It's already been done using AV under the excuse of "think of the children" when the truth is closer to deanonymizing the internet.

The second is done by a private company, like Palantir: they do not carry legal power on detaining people as they are not the police nor the justice system. The only thing they can do is harvest data from people and monitor them, but even if they witnessed something "illegal" they still can't arrest or imprison people themselves (while both the government or NSA has that leverage as five eyes are already doing that).