He kind of models himself after Andrew Carnegie...who achieved pretty much monopoly control over the steel industry in the 19th century U.S. Steel was a vital commodity as this was the period of time when the railway network was being built across the U.S. ...and building steel rails was very big business.
Carnegie...like Gates did some nasty things. In Carnegie's case it was setting out to bust the union at Carnegie Steel's Homestead, Pennsylvania works in 1892. Carnegie was successful and set back unionization of the steel industry for 40 years.
Of course afterwards Carnegie did all kinds of charitable things including building public libraries...in fact as a kid I made regular use of one of them.
But we should not forget how Carnegie amassed his wealth...and neither should we forget how Bill Gates amassed his wealth. Gates achieved his wealth not necessarily by writing innovative software but by controlling the software market with a vice-like grip.