20k$ dumped to 6K$ was difficult but happened, 6k$ to 500$ is very easy soon will be worthless, So Why Some People Dont Believe BTC is SCAM?
A falling price does not make it a scam.
The price of an Amazon.com share went from $105 in 1999 to $8 in 2001. Is Amazon.com a scam?
Yes that would be right. Just because the price fall from $20k to $6k you would immediately say it is scam? Just like the example above, Amazon is clearly a legit company and the same would be applicable to bitcoin. It is not a scam because no one intends to defraud people about bitcoin by creating it and then creator run with the money because even if we don't know the creator of bitcoin, his bitcoin is still there and it wasn't touch.
Some people would just say bitcoin is scam because of lack of knowledge about it. If they would deeply understand it then they can say that the company that uses bitcoin to scam others are the one that are illicit but bitcoin alone is not scam.