Because of the obvious barriers to entry to reach a point where you are exploiting workers? Or because some people probably would prefer not to exploit others f

Because of the obvious barriers to entry to reach a point where you are exploiting workers? Or because some people probably would prefer not to exploit others for profit? Your point would make some sense if all owners of companies bootstrapped them from startups, when in reality they were likely just someone who was otherwise wealthy and became owners once it was already a successful company when the original owners already cashed out (or passed on, depending on the age of the company).