In that case, why not go the extra mile and register as a nonprofit? After all, if you are not generating profit, why go to all the trouble of having shareholders and the like?

Reinvesting profit doesn't make you not profitable, it just means you've decided to grow with your profit rather than extract it. Amazon doesn't have small profits, they've just plowed their money into growth.

You're confusing profit with revenue. By definition Awazon will have small profits if they put most of their revenue into growth.

No, I'm not confusing anything. What they're putting into growth are undeclared profits, that's a simple fact. When a business subtracts the cost of doing business from revenue, the remainder is profit, regardless of whether that profit is declared as such or whether it's put back into the business to grow it and thus avoid taxation. They could not "grow" if there weren't any profit left over after costs, just because you don't declare taxable profit doesn't mean you didn't have profits.