I've had two different family members complain that now days when they unlock their Fire Tablet, it launches the Amazon Store app to display the product page of

I've had two different family members complain that now days when they unlock their Fire Tablet, it launches the Amazon Store app to display the product page of whatever product was being advertised when they unlock the tablet. Is Amazon charging businesses who use their ad platform a fee based on how many times they display a product page?