I have witness many events where people refer to cryptocurrency as scan, because of lack of understanding and awareness on how cryptocurrency works, and aslo the  way to approach cryptocurrency in other for them not to get scammed.
alot of people are not aware that someone can easily be scam with cryptocurrency and it online exchanges, because they lack understanding that alot of cryptocurrencies and alot of crypto online exchanges out there are scam. and when those who lack understanding about cryptocurrency get scammed, they we come into conclusion that cryptocurrency is a scam.

That's why I always advise that individuals need to understand the risks that are involve in cryptocurrency  because everything about cryptocurrency is risk taking including, crypto trading, crypto investment and  it online exchanges.

Secondly without proper understanding of cryptocurrency and it online exchanges, individuals may fall prey to scam, making them vulnerable to scams and frauds, which may result to financial looses, and they we start calling cryptocurrency a scam.

And thirdly the one that funny me the most, is the one they refer to the price movement in the crypto market as scam, because of increasing and decrease in price of cryptocurrencies in the crypto market, which I also refer to that as lack of understanding of the crypto market.
Cryptocurrencies are volatile in nature it price movement can make someone believe that cryptocurrency is a scam.

without the proper understanding and the awareness that cryptocurrencies are designed to fluctuate rapidly and unpredictablely in price you we refer to cryptocurrency as a scam.