The powers to “break up” corporations with too much power are extraordinarily weak.
For all the time spent in school about anti-monopoly efforts in the early 1900s… one would think there are none anymore.
Just as it is with slavery. Look at the “except” in the 13thA – it’s right in front of us the whole time that slavery was never made wholly illegal. Just “out of sight, out of mind”, like US corporate superpowers are effectively monopolies. Joe’s answer nails it.