Or you could serve a lot of people, it's probably easier.
Sell something for $10 that's worth $12 to the buyer and costs you $8 to make. Repeat a billion times. The people you did business with got an extra $2 billion, you got $2 billion, everybody's better off.
The main issue is that all of these companies these days are selling things for $7 that cost $8 to make. Repeated a billion times.
The people you did business with got an extra $5 Billion, you lose $1 Billion. All the companies trying to offer the service for $10 (or some other fair price) will be eradicated by your company, because a company cannot compete selling things at a fair ($10) price when you are selling it at $7.
To paraphrase what others said: that’s a great way to become a multimillionaire, but to get to a billion you have to step on a lot of toes. I think Bill Gates observed that your quality of life doesn’t really change after about 50 million. Even with inflation, by the time that’s a billion, billionaire won’t be what people target. Hell, 40 years ago people dreamed of being millionaires. Inflation adjusted that’s only 3 million now.
If you were really that philanthropic, why would you carve out a billion from that revenue stream instead of giving back, or investing it in better equipment or people?
You realize that a billionaire has almost nothing to do with their money but invest it in better equipment or people? That's what investing is and that's what billionaires do with their money.
So on the front end the billionaire had to give more than a billion dollars of value to society in order to get people to voluntarily do business with them. Then on the back end they have to turn around and invest most of that money back into society. In doing so they're shouldering the burdens of market research, diligence, and risk.
Society wins twice from this and in return the billionaire gets to spend a lot of money. Society wins there, too, because the economy benefits from their ridiculous spending.
Does this work perfectly? Absolutely not, but nobody has a better system that I've seen.
To become a trillionaire you'd have to fuck over 1000 times as many people. Without getting lynched.