Its not that BTC is a scam, it is that BTC is not currency. It is a commodity that people use as a form of exchange. Currencies are issued by governments. BTC may exist for quite a while by governments, but when it becomes viewed as inconvenient by any government, it will be banned. Some/many will continue to use it as a black market form of exchange, but it is still a commodity.
Its not that BTC is a scam, it is that BTC is not currency. It is a commodity that people use as a form of exchange. Currencies are issued by governments. BTC may exist for quite a while by governments, but when it becomes viewed as inconvenient by any government, it will be banned. Some/many will continue to use it as a black market form of exchange, but it is still a commodity.