that’s not true. It’s up to 90 days.
it’s VERY common to be admitted for the full 90, yes, but my point was if they are concerned it’s being used incorrectly, they can choose how long. I had my ESTA admittance once marked for less than 90, but that was due to when my passport was expiring.
it definitely IS NOT 90 days or nothing. Please don’t spread mis information.