Do you have evidence Amazon sold books at a loss for 20+ years? Buying a book for $10, selling it for $12, then spending $5 on a new warehouse is cash flow neg

Do you have evidence Amazon sold books at a loss for 20+ years? Buying a book for $10, selling it for $12, then spending $5 on a new warehouse is cash flow negative but not selling at a loss. Amazon isn't even cash flow negative anymore.