And even if Bitcoin is not a scam by itself, there are a lot of scams involving Bitcoin, and that only brings bad reputation to the coin.
I agree here, Bitcoin is not for everyone just like trading on Forex or stock exchanges is not for everyone - people lose money constantly on various investments, but we will hardly hear that they will accuse a well-known (influential) company of being a scam because their shares lost overnight 20% or more in value. As in real life, people fiercely attack those who cannot or do not want to defend themselves, and given that Bitcoin is decentralized, it is very easy to say that it is a scam and that it consumes electricity like some country, and that we will remain in the dark because of Bitcoin mining.
Of course, scammers use Bitcoin to the limit, but you should never blame the tool, but the person who uses that tool. Besides, for a scam to succeed, there is always a need for a naive victim, and the fact is that we have millions of people who behave just like that thanks to governments that do not provide for their education.