A CTO of a startup might be coding day to day, making technology decisions, and have a team or two underneath them. In F500 or Corpro world, this is more like a engineering manager or tech lead. In most big companies a manager does zero coding and rarely makes a tech decision, you go up to a director level, they might have 100-200 people under them, direct reports are almost all managers, and they never touch tech. Go higher up to VP or CTO levels and they are just so divorced from code that it doesn't make sense why a CTO in a startup would translate.