Actually, Bitcoin has been performing the role of a currency, a medium of exchange, a payment system for almost 10 years now. Plus, it approved itself as a store of value. People post such things because of their ignorance or bad experience with crypto. If you dont believe in bitcoin and dont want to buy it, it is your choice, but let others decide for themselves.
No, it has not. For almost 10 years now, Bitcoin has been performing the role of a classical pyramid scheme. Currency and medium of exchange have always had one one fundamental feature - consumability, i.e. end consumers were able to use them for satisfying their needs, like I explained in the OP. Bitcoin has no such feature - nobody who has it is able to satisfy their needs with it, which is why it can only be transferred from address-to-address. And the investment in the non-consumable resource which cannot be used, but only transferred from hand-to-hand is the fundamental feature of a pyramid scheme.