Once you have mastered using other peoples money successfully, you can leverage it to buy properties and businesses too. Business acquisition is one of the quickest ways to grow your business.
If you and a competitor have taken ten years to build your business at the same rate, then you can double the size of your business by simply buying your competitors business, without having to wait another ten years.
You can even buy businesses by using the revenue in the business as income to pay the loan used to buy it.
So yes, you could even buy Amazon if it was for sale by using the revenue it makes to pay the $3 trillion loan.
It's no different from buying a house where the rental income more than covers the mortgage. People don't, because they think they need $3 trillion in their bank in order to make a offer.
Homeowners - Did you pay for your house up front in cash?