If you want to make big money, offer something that people want, but no one else can offer.
The Portuguese sourced spices in the Fifteenth Century. Rockefeller locked up East Coast oil distribution in the Nineteenth Century. AT&T was once the only option for phone calls in much of the last century. They made huge profits.
The digital world can be ripe for monopoly or near monopoly, sometimes because only one company unlocked the key to a technology, and sometimes because the software or…