Everything in the US is a scam.

Same in the EU. I believe 100g or 100ml is mandated, but then they can add a "per serving" table as well.

In the U.S. they use deception to make it unclear how many servings are in a container.

And they'll do this in multiple different ways. They'll do things like selling you a single candy bar and claiming that it has like 8 different servings, but the amount that each serving is supposed to be isn't set by any standard, so one company may have the serving be a whole bag, one may be half a bag, one may be like 1/4.7 of a bag(and yes, they'll literally say there are 4.7 settings in a bag).

And they might sell you an teeny tiny individual bag of chips and claim that a serving is like 1.87 chips.

I bought a snack food a while back, and it was a very small container, but the nutrition information was listed deceptively to imply that it had 180 calories. In the store, the bag was next to multiple similar foods that all had roughly the same health information and were all about 200 calories. I am health conscious and I checked the calories and saw that it had 180 calories. So I tried it, and I liked it, and bought it fairly regularly for about two months(and by that, I mean about once a week).

After about two months, I happened to notice that the serving size listed for this product wasn't the same as the other foods next to it on the shelves, but that instead the serving size was about 1/3 the serving size of the similar products. I found out I'd been eating 540 calories per bag, when literally all of the similar products on the shelf next to it had 200 calories per whole bag. The servings for the others were one per bag, but for this product, there was no indication that the bag wasn't a single serving.

And I wish that they'd use SI units, but they don't.

People in the U.S. have trouble searching for information for the nutritional value of the food, and companies intentionally lie, trick, and deceive, and then some are also very direct in making things completely ridiculous.