This is a bit of a side issue, but if a company really does reinvest the money into its business, in most cases that reinvestment will be spent on things that are deductible as a business expense, so that portion of revenue won't be profit and not subject to corporate income tax. That's one reason Amazon pays close to zero corporate income tax: they book very little in profit, since they reinvest most of the their revenue into qualifying business expenses to expand the business.