Unironically, they've already done that.
Microsoft put a PC on every desk, running Microsoft software.
Facebook connected the world to all their friends and relatives.
Amazon first revolutionized e-commerce, making it possible to buy almost anything from almost anywhere. Then they revolutionized server computing, making it possible for anyone to spin up a software backend and scale it out without buying or leasing your own servers.
Apple got pocket sized general purpose computers into the pockets of the majority of people in the world (through iPhone and inspiring Android).
Google enabled people to find pretty much any piece of human knowledge or information.
The problem is, once those goals were accomplished, there was a still a need to keep revenue and profits rising. Which always seems to end up with selling ads at some point.