The defining characteristic of a pyramid scheme is that the income at each level is predominantly connected to the recruitment of new members into the scheme. Twice as many new members per unit time translates to twice as much income, roughly speaking.
In management hierarchies, that may play a certain role, but your manager in a company isn't payed proportionally to how many new employees they recruit each month (unless they are explicitly a recruiter). It is rather proportional to the amount of responsibility which often correllates to the number of reports and their reports.
In other words, oversimplified, in corporate hierarchies, the pay relates to the number of people below you, while in a pyramid scheme, it relates to the first derivative of that value.