Think of it this way: the “cost” to realize a net profit of $450 is a tax expense of $450. What if you could reinvest that full $900 so that next year your revenue and income are higher? High-growth businesses will optimize for reinvesting because they expect the Return on investment to be higher than the return on realized profit going forward.

This is what Amazon has done for years - it generates a monstrous amount of cash (free cash flow) from retail and funnels it back into expanding current businesses and creating new ones such as AWS. AWS now generates its own surplus, so the cycle continues.

Edit to clarify: Amazon in the past has shown a relatively small net income vs large top line revenue because most cash is reinvested. It’s been a few years since I paid attention to their financials so things may be different now.