Amazon retail and logistics were plenty sustainable before AWS profits came along.

https://www.macrotrends.net/stocks/charts/AMZN/amazon/profit...

https://dazeinfo.com/2019/11/06/amazon-net-income-by-year-gr...

Even Walmart and the other retailers have the same 2% to 5% profit margins for their entire existence, without selling high margin web services.

https://www.macrotrends.net/stocks/charts/WMT/walmart/net-pr...