Lack of need to do so to track dissidents deemed dangerous to the function of the state

The closest esperanto ever got to revolutionary usage was that some esperantists taught it to others in Gulags and Concentration camps while pretending it was another language to avoid the suspicion of Nazis and Soviets, who both regarded it as subversive because it was a language explicitly designed to be “easy” to learn and to encourage international cooperation

Toki-Pona was invented in the 2000s and achieves it’s low word count by basically just reducing itself to a pre-civilizational language without concepts for most colors and not having a proper numeral system, things that might be necessary for use in inspiring and carrying out an ideologically motivated revolution.

The closest America has to a language usable as a code language used by a dissident underclass is AAVE, which is a dialect of english that’s been trending towards american standard english as time has gone by and is even easier to learn to understand than Toki-Pona or Esperanto if a man in a suit was determined enough to spy on its speakers.