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"How is Amazon going to pay sellers their money if Amazon has no data on what is bought and sold?"

I might agree with you if this sentence used a generic term instead of "Amazon". However it specifically refers to Amazon.

I think people forget that Amazon did not operate as a middleman when they first appeared in the early 1990's.

Amazon was originally a bookseller, not a middleman for other sellers.

Not only does the sentence above from GP assume the existence of Amazon, it assumes that Amazon must act as a middleman for other sellers.