Again, the reason bitcoin is a scam and Amazon is not, is because Amazon is not trying to promote themselves as a currency. Regardless of their stock price or how rich the founder is, Amazon is still a productive company that does useful work.
Sure you could make that claim but not sure how a comparison to Amazon furthers it. Bitcoin is a currency and therefor a scam, Amazon is not a currency and therefor not a scam?
No, neither are currencies. Cryptocurrencies try to promote themselves as currencies, but they're actually not, and they can't ever function that way, for a number of reasons.