That's funny.

They are subject to a different set of legal jurisdictions. It's like being a foreigner in your own country, because you're foreign to the jurisdiction of man made laws and regulations.

For example: A national who isn't a citizen doesn't owe an income tax, except for two extremely rare circumstances. The IRS has relabeled a national as a "nonresident alien".

The IRS jurisdictional statement is in the very beginning of their federal code 26 CFR 1-1.1 (a).

https://www.law.cornell.edu/cfr/text/26/1.1-1

(1) Section 1 of the Code imposes an income tax on the income of every individual who is a citizen or resident of the United States and, to the extent provided by section 871(b) or 877(b), on the income of a nonresident alien individual.

Let's look at the 3 categories of "individual" that are referred to in the IRS's jurisdiction statement.

• Citizen - A 14th amendment US citizen... who is also a national. Both, but nobody knows about this fact of law. (Note: It's worth mentioning that 14th amendment citizens were created after the civil war, and were originally the former slaves, who were subjected to horrendous Jim Crowe laws, etc.
  They've literally made all citizens into Jim Crowe.).
  US Citizens have civil rights (but not constitutionally protected rights), hence the civil rights movement, etc.

• Resident - green card holder who is permitted to work in the US, and therefore pays income taxes.

• Nonresident alien - a national of the USA who is not a citizen. These person's have God given rights, and constitutional protections if those rights.

This is the status of a free individual. They renamed it, because if the IRS said that nationals only had to pay two small second of the IRS code, then everyone who read this statement would be searching to figure out how to become a national (and not pay income taxes).
You have a choice to volunteer for this status, but it's never disclosed.
There are no downsides that I'm aware of.

This lack of disclosure is fraud by non-disclosure. Literally fraud.

Bro. I've done this already myself, and I've tested my status in state court. Judges are in the know, and recognize this. It's discretely written into our laws.
I'm not trying to trick you.