Bitcoin has actual worth in the sense that people think it has worth. That does not make it a scam. It is exactly the same as buying any other thing that has worth far above its usefulness. Gold is not priced according to its use, but according to what people are willing to pay for it. That does not make Bitcoin or gold a scam.
To me, Bitcoin is worthless, but I could theoretically buy it as an investment. I do not that makes me a scammer. It would just make me a risk taker. As I see it, Bitcoin is bad for the planet, and should be forbidden somehow. If sufficiently many people thought like I do, Bitcoin’s value would drop, and many would lose their money, but I still do not think it would make Bitcoin a scam.