You can become a millionaire by scaling up almost any business. I doubt you’d become a billionaire but who cares?
Get a self-driving truck, and add some sort of people-sensing system that allows potential customers to intuitively flag it down. Then add a self-serve ice cream vending machine.
Now you can build a fleet of ice cream trucks that don't need human operators. I think you could make a few millionaires with that.
My point is not that automated ice cream trucks are the future. My point is that "small" improvements amortized across enough units can be significant.
Now, there's probably a pretty hard ceiling to the amount of income one of these trucks can bring in, so investing in business intelligence or a snazzy customer experience probably isn't a good investment. (Which is probably what parent was imagining.)
But don't underestimate the power of shrinking costs. If you sell a billion screws a year, a one-tenth of a cent improvement in unit manufacturing cost is a million dollars a year.
That's probably what people said about coffee and cafes prior to Starbucks.
Only in a place where coffee is generally awful, and VC money easy, could the concept that became Starbucks ever come into existence.
But that's all beside the point. I'm not saying an Italian would be able to replicate Starbucks in Italy. What I'm saying is that there are countless opportunities staring us right in the face, every day, and 99% of people see a cafe and think "it can't scale, it's local demand only, there's no point, why bother", the remaining 1% see Starbucks.
Luigi Zingales, an economist at UChicago, once said, "the fact that Starbucks is not Italian is hurtful. The extreme agency problems of Italy make it difficult to scale firms.".
Would THAT be worth it then? Maybe not to you, but to the guy who came from a third world country and built his company from nothing and now he's living an upper middle class lifestyle? To that guy it's the essence of the American Dream.
You can throw as much business intelligence and automation to, let's say, an Ice Cream truck. It will still be an Ice Cream truck. Nobody is becoming a millionaire with it.