Yeah, no. The competitor-focused strategy that worked for Rockefeller in a nascent industry like oil in the mid-1800s doesn't translate to success in a mature one such as staffing in the 2010s.
Nevertheless, his is a great story, and well told by Hustle.co:
To grow the business, Rockefeller took an approach similar to other business magnets at the time: remove competitors at all costs.
Standard Oils early refinery.
By 1872, only a few years into business, Rockefeller used a series of acquisitions to become the largest refinery in the world. When asked about why he was so driven to grow the company so fast, Rockefeller said: Having being endowed with the gift I possess, I believe its my duty to make money and to use the money I make for the good, he said.
To continue growing, he went on a buying spree, buying two dozen refineries in 60 days. To finance the everything he reinvested the profits and begged banks for more money. Before this series of acquisitions, few businessmen understood how monopolies worked. Rockefeller was the first to focus on aggressive growth by buying smaller companies, a move that pioneered modern American capitalism.