Some people think that bitcoin is a scam as a result of their frequent encounters with fraudulent activities using bitcoin, and sometimes, bitcoin platforms. No matter how genuine bitcoin as a currency is, frequent encounters of scam with it or its platforms can change people's mind to consider it as a total scam without distinguishing between bitcoin and scam, but that is not appropriate. For example, for the fact that pound or dollar is a genuine currency, does not mean that scammers can not use them for scam, likewise bitcoin.
Since Bitcoin had been in existence for long, why would a person still think that Bitcoin is a scam. It is obvious that there are people that uses Bitcoin for scam and that does not mean that Bitcoin is scam. Everyone have there own opinion and what they think about but for us that had been in the market for long time and knows how all works. It is our responsibility for us to educate people that do not understand what Bitcoin truly means and the motive of Satoshi for creating a payment system where people can use for transactions without any third party.