Its funny how this is a worry but it basically never happens. There is basically a incredibly tiny number of actual cases where this 'predatory pricing and then raise prices' has worked and not in markets as open as e-commerce and delivery that other companies could easily get into.
In fact historically this has not happened before Anti-Trust laws. It has basically been used by competitors who couldn't compete on the market so they went to their friends in government to stop their competition. Since they didn't want to argue 'Their product is better and cheaper' they argued, 'Its predatory pricing, as soon as I'm gone this company is gone raise prices'.
The first US anti-trust law was enacted because butchers were extremely angry about centralized slaughtering houses that used refrigerated trains to transport meat. Classic special interest politics. But somehow 150 years later the evil centralized slaughtering houses haven't raised the prices yet.
Amazon has always focused on lowering prices, as long as Bezos is around I don’t expect that to change. By the way Walmart clobbered competition with lower prices for last 60 years, did all retail go away? No, in fact several places like Target, Costco etc popped up and have carved out a niche and they all still compete on prices
