That you're not an accountant must be the reason you don't understand spending on R&D isn't hiding profit. If you spend the money, it's not available as profit.

Now, you use the term "hide" in relation to profit - which blatantly implies illegal activity. If that's the case, please provide the financial statements that you used to derive that immense legal claim. Amazon is a half a trillion dollar corporation with a vast number of very wealthy shareholders that would love to see all of this stolen profit that is being kept from them.