Of course, we'll ignore the huge issues that Airbnb created for cities, customers, and providers. We'll ignore the way they knowingly helped ignore any regulations on tourism as much as they could. We'll ignore the business model of simply being the biggest middlemen around. We'll ignore the fact that their business is slowly being outlawed in major cities, at least in Europe, because of all of the above.
And, surprisingly, if we ignore all of the things these founders do to ignore the law and cheat the market or their competition, we can say that they earned their billions without cheating!
We'll also ignore the fact that the brilliant magic math that us lay people and politicians just don't understand also predicts that the founder whose business is growing 93% per month will not only be a billionaire in 9 months, but a trillionaire 9 more months after that, and surely the world's first quadrillionaire within 5 years. You might think this is implausible, but that's just because you don't understand how exponential growth works!