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I don't generally disagree with your comment, but I don't think Amazon had other sources in its earlier days (at least not AWS).

Amazon didn't have other sources, but they also didn't have a ton of competition or one "big guy" like Jet has with Amazon.

Exactly this. Jet.com is literally building a business model for the mid-to-late 90s, as if there is no one in the space.

They are throwing tons of cash at poaching Amazon's (et. al.) customers and largely competing on price. It's completely nuts.