Amazon is the same as Google, Meta, Twitter, etc in the sense that they have a couple of wildly profitable products that enables the company to 'play' at running some other businesses that might turn a profit eventually after investing fifty billion. For Amazon it's the retail business and AWS. For Google it's AdWords. For Meta it's Facebook Ads. These businesses will never die, or even face a threat to their futures, despite throwing billions at self-driving cars, AI, phones, VR, etc.

The only existential threat to FAANG companies is a shift in consumer behavior away from spending money on things they see ads for. That's quite unlikely.