In my opinion everything could be a scam, even bitcoin, bitcoin was born as a decentralized cryptocurrency ,now many things have changed since 2009, the spirit of bitcoin is no longer the same as when it was born, now it has become a very speculative cryptocurrency. Many sniffed the deal and threw themselves in.
Well if you talk about scam then there are many scam here worst than bitcoin. However, I can't say that bitcoin is scam because people are exchanging it with their fiat and that how bitcoin market was decided. Bitcoin became like a gold and that like an asset. If anything that is connected to fiat currency that thing will have the value already. This is the reason why bitcoin too became volatile. And when you check the bitcoin feautures then we can say that it has a good feature which you can take advantage.